Question

find height of a cylinder with radius 21 m and total surface area 3960 square metre

Answer 1

Radius of cylinder= 21 m
TSA of cylinder= 3960
=> 2πr(h+r) = 3960
=> 2*22*21(h+21)/7 = 3960
=> 44*3(h+21) = 3960
=> (h+21) = 30
=> h= 9 cm


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Answer 2

tsa of cylinder=2*22/7*r(r+h)
2*22/7*21(21+h)=3960sq.m
44*3(21+h)=3960
132(21+h)=3960
2772+132h=3960
132h=3960-2772
132h=1188
h=1188/132
h=9