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ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.3 in Chapter 17 - Mensuration
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Question 24 Mensuration Exercise 17.3
Find: The total surface area of a hemisphere of radius 21 cm.
Answer:
Solution:
By dividing the sphere into two equal halves, we can produce a hemisphere. The base area of the hemisphere added to its curved surface area gives the hemisphere its total surface area.
Total surface area of the hemisphere = 3π r2
= 3×(22/7)×212
= 3×22×3×21
= 4158 cm2
Hence the total surface area of the hemisphere is 4158 cm2. 
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