The radius of a coin is 2o cm find its surface area
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8
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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Answered by
5
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
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