Answer :

Area of base of cylinder = π × r2


Curved surface area of cylinder(CSA) = 2π × r × h


Here, CSA = 660 sqcm, h = 21 cm, r = ?


CSA = 2π × r × h


660 = 2π × r × 21



r = 5 cm


Area of base = π × r2


= 3.14 × 25 × 25


= 78.5 cm2


Area of the base is 78.5 cm2 and radius is 5 cm


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