09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Example 7
Example 7: Find the surface area of a sphere of radius 7 cm. Example 6 Example 8
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Example 6
Example 6: A corn cob (see Fig. 13.17), shaped somewhat like a cone, has the radius of its broadest end as 2.1 cm and length (height) as 20 cm. If each 1 cm2 of the surface of the cob carries…
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Example 5
Example 5: The height of a cone is 16 cm and its base radius is 12 cm. Find the curved surface area and the total surface area of the cone (Use π = 3.14). Example 4 Example 6
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Example 4
Example 4: Find the curved surface area of a right circular cone whose slant height is 10 cm and base radius is 7 cm. Example 3 Example 5
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 9
Question 9: A heap of wheat is in the form of a cone whose diameter is 10.5 m and height is 3 m. Find its volume. The heap is to be covered by canvas to protect it from rain. Find…
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 8
Question 8: If the triangle ABC in the Question 7 above is revolved about the side 5 cm, then find the volume of the solid so obtained. Find also the ratio of the volumes of the two solids obtained in…
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 7
Question 7: A right triangle ABC with sides 5 cm, 12 cm and 13 cm is revolved about the side 12 cm. Find the volume of the solid so obtained. Question 6 Question 8
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 6
Question 6: The volume of a right circular cone is 9856 cm3. If the diameter of the base is 28 cm, find (i) height of the cone (ii) slant height of the cone (iii) curved surface area of the cone…
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 5
Question 5: A conical pit of top diameter 3.5 m is 12 m deep. What is its capacity in kilolitres? Question 4 Question 6
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09
Dec
Class 9 | Chapter 13 | Surface areas and Volumes | Exercise 13.7 | Question 4
Question 4: If the volume of a right circular cone of height 9 cm is 48 π cm3, find the diameter of its base. Question 3 Question 5
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