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ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.2 in Chapter 17 - Mensuration
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Diameter of the base of a cone is 10.5 cm and slant height is 10 cm. Find its curved surface area.
Answer:
Solution:
The shape of a cone is produced by stacking several triangles and spinning them around an axis. It has a total surface area and a curved surface area because it has a flat base.
Given diameter of the cone = 10.5 cm
Radius, r = d/2 = 10.5/2 = 5.25 cm
Slant height of the cone, l =10 cm
Curved surface area of the cone = π rl
= (22/7)×5.25×10 = 165 cm2
Hence the curved surface area of the cone is 165 cm2. 
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