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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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