Question

find the area of base and the radius of a cylinder if its curved surface area is 660 square and height is 21 CM

Answer 1

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Answer 2

let, r and h be the radius and height of cylinder.
curved surface area of cylinder=2πrh
660=2×22/7r21
660=132r
r= 5
therefore, radius is 5cm
area of base= πr²
=22/7×5²
=550/7
=78.57
therefore, area of base is 78.57cm²