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ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.2 in Chapter 17 - Mensuration
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Curved surface area of a cone is 308 cm2 and its slant height is 14 cm.
Find total surface area of the cone.
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.
Total surface area of the cone = Base area + curved surface area
=π r2+ π rl
= (22/7)×72 +308
= (22/7)×49 +308
= 154+308
= 462
Hence the total surface area of the cone is 462 cm2. 
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