surface area of hemisphere Archives – Mathemafia http://sh016.global.temp.domains/~mathemaf/tag/surface-area-of-hemisphere/ Mathematics is like music - Enjoy it!!! Thu, 11 May 2023 08:49:42 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://mathemafia.com/wp-content/uploads/2020/08/cropped-M__Logo__SM-1-32x32.png surface area of hemisphere Archives – Mathemafia http://sh016.global.temp.domains/~mathemaf/tag/surface-area-of-hemisphere/ 32 32 Class 9 Chapter 11 | All Solutions | Surface Areas and Volumes https://mathemafia.com/class-9-chapter-11-all-solutions-surface-areas-and-volumes/ Thu, 16 Dec 2021 15:36:02 +0000 http://sh016.global.temp.domains/~mathemaf/?p=7192 This playlist consists of 101 questions, concepts, theorems and examples of class 9 chapter 13 (Surface Areas and Volumes) of class 9, NCERT textbook. Click a thumbnail to watch the tutorial. Every video in this series has been thoroughly visualised…

The post Class 9 Chapter 11 | All Solutions | Surface Areas and Volumes appeared first on Mathemafia.

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This playlist consists of 101 questions, concepts, theorems and examples of class 9 chapter 13 (Surface Areas and Volumes) of class 9, NCERT textbook. Click a thumbnail to watch the tutorial.

Every video in this series has been thoroughly visualised 🔍  prior to preparing the corresponding tutorial. This chapter is always a trouble to some extent to students 👩‍🎓. The reason is more the lack of visualisation rather than the knowledge of the subject. Every shape that we refer in these questions is used in our daily life in the form of different utensils, sports objects or other household objects like: Circle, sphere, cone, cylinder , cuboid can be compared to Roti, Cricket ball, Ice Cream cone, a glass and a gift box  🎁  respectively.

In every question, real life objects are used to better explain the questions so that you can also visualise and not just solve a question momentarily. Primary focus is to help students understand the underlying concepts and not just go with RATTEBAJI.🥸  🥸  🥸

Watch complete chapter on YouTube

There has been a lot of efforts  🏋️‍♀️  🏋️‍♀️  🏋️‍♀️   put in all these videos (Class 9 Chapter 13) and it will be really great and helpful if you share these videos with your friends  👯‍♀️ 👯‍♀️ 👯‍♀️   and classmates. You can share through WhatsApp, SnapChat, Messenger etc. Click any of the following icons to share it now.

The post Class 9 Chapter 11 | All Solutions | Surface Areas and Volumes appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Example 10 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-example-10/ Wed, 09 Dec 2020 13:19:43 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3676 Example 10: A hemispherical dome of a building needs to be painted (see Fig. 13.21). If the circumference of the base of the dome is 17.6 m, find the cost of painting it, given the cost of painting is `…

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 10 appeared first on Mathemafia.

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Example 10: A hemispherical dome of a building needs to be painted (see Fig. 13.21). If the circumference of the base of the dome is 17.6 m, find the cost of painting it, given the cost of painting is ` 5 per 100 cm2.

Example 9
Example 11

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

Example 13

Example 14

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Exercise 13.1

Question 1

Question 2

Question 3

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Question 5

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Question 7

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Exercise 13.2

Question 1

Question 2

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Exercise 13.3

Question 1

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 10 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Example 9 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-example-9/ Wed, 09 Dec 2020 13:19:39 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3675 Example 9: The hollow sphere, in which the circus motorcyclist performs his stunts, has a diameter of 7 m. Find the area available to the motorcyclist for riding. Example 8 Example 10

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 9 appeared first on Mathemafia.

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Example 9: The hollow sphere, in which the circus motorcyclist performs his stunts, has a diameter of 7 m. Find the area available to the motorcyclist for riding.

Example 8
Example 10

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

Example 13

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Exercise 13.1

Question 1

Question 2

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Exercise 13.2

Question 1

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Exercise 13.3

Question 1

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Exercise 13.4

Question 1

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 9 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Example 8 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-example-8/ Wed, 09 Dec 2020 13:19:34 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3674 Example 8: Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm. Example 7 Example 9

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 8 appeared first on Mathemafia.

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Example 8: Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm.

Example 7
Example 9

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

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Exercise 13.1

Question 1

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Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 8 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Example 7 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-example-7/ Wed, 09 Dec 2020 13:19:31 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3673 Example 7: Find the surface area of a sphere of radius 7 cm. Example 6 Example 8

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 7 appeared first on Mathemafia.

]]>

Example 7: Find the surface area of a sphere of radius 7 cm.

Example 6
Example 8

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

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Exercise 13.1

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Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Example 7 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 9 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-exercise-13-4-question-9/ Wed, 09 Dec 2020 05:47:01 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3347 Question 9: A right circular cylinder just encloses a sphere of radius r (see Fig. 13.22). Find surface area of the sphere curved surface area of the cylinder ratio of the areas obtained in (i) and (ii) Question 8 Ex:…

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 9 appeared first on Mathemafia.

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Question 9: A right circular cylinder just encloses a sphere of radius r (see Fig. 13.22). Find

  1. surface area of the sphere
  2. curved surface area of the cylinder
  3. ratio of the areas obtained in (i) and (ii)
Question 8
Ex: 13.5 | Question 1

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

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Exercise 13.1

Question 1

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Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 9 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 8 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-exercise-13-4-question-8/ Wed, 09 Dec 2020 05:46:57 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3346 Question 8: A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl. Question 7 Question 9

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 8 appeared first on Mathemafia.

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Question 8: A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl.

Question 7
Question 9

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

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Exercise 13.1

Question 1

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Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 8 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 7 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-exercise-13-4-question-7/ Wed, 09 Dec 2020 05:46:52 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3345 Question 7: The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas. Question 6 Question 8

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 7 appeared first on Mathemafia.

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Question 7: The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.

Question 6
Question 8

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

Example 13

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Exercise 13.1

Question 1

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Exercise 13.2

Question 1

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

Question 1

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Question 10

Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 7 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 6 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-exercise-13-4-question-6/ Wed, 09 Dec 2020 05:46:48 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3344 Question 6: Find the radius of a sphere whose surface area is 154 cm2. Question 5 Question 7

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 6 appeared first on Mathemafia.

]]>

Question 6: Find the radius of a sphere whose surface area is 154 cm2.

Question 5
Question 7

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

Example 13

Example 14

Example 15

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Exercise 13.1

Question 1

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Question 8

Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

Question 1

Question 2

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Question 8

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Question 10

Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 6 appeared first on Mathemafia.

]]> Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 5 https://mathemafia.com/class-9-chapter-13-surface-areas-and-volumes-exercise-13-4-question-5/ Wed, 09 Dec 2020 05:46:44 +0000 http://sh016.global.temp.domains/~mathemaf/?p=3343 Question 5: A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of ` 16 per 100 cm2. Question 4 Question 6

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 5 appeared first on Mathemafia.

]]>

Question 5: A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of ` 16 per 100 cm2.

Question 4
Question 6

Sphere – Surface area

********* This section will be updated later *********

 

Surface area of sphere = 4πr²

r = radius of sphere

Lateral or curved surface area of hemisphere = 2πr²

Total surface area of hemisphere = 2πr² + πr² = 3πr²

r = radius of sphere

What is Area / Surface area / Volume

It is recommended to understand the core concept of area, surface area and volume before we attempt any question based on these concepts.

 

Chapter 13 – Surface areas and Volumes

​

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Examples

Example 11

Example 12

Example 13

Example 14

Example 15

Example 16

Example 17

Example 18

Example 19

Exercise 13.1

Question 1

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Exercise 13.2

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Exercise 13.3

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Exercise 13.4

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Exercise 13.5

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Exercise 13.6

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Exercise 13.7

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Exercise 13.8

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Question 10

Concepts

The post Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.4 | Question 5 appeared first on Mathemafia.

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