Question

The radius of a coin is 2o cm find its surface area

Answer 1

area = pi * r^2

If r = 20 cm then the area of each side is 400 pi sq cm.

Since a coin has 2 sides, the total surface area is 800 pi sq cm.

or 2513.27 sq cm

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Answer 2

Explanation:

radius of coin = 20

surface area of coin= pie r^2

= 3.14× (20)^2

= 3.14 × 400

= 1256cm^2

coin has a two faces= 1256+ 1256

= 3512cm^2