Mathematics is like music – Enjoy it!!!
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…
Read MoreExample 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 `…
Read MoreExample 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
Read MoreExample 8: Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm. Example 7 Example 9
Read MoreQuestion 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:…
Read MoreQuestion 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
Read MoreQuestion 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
Read MoreQuestion 6: Find the radius of a sphere whose surface area is 154 cm2. Question 5 Question 7
Read MoreQuestion 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
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