Question

find the total surface area of hemisphere of diameter 42 cm

Answer 1

d = 42
r = 21
tsa = 3 pie r sq.
3(22/7)(21)(21)
4158cmsq.

Answer 2

sry above is c.s.a
TSA,=3πr²
r=21

3*22/7*21*21
66*3*21
198*21

ans =4158

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