Question

If a radius of a coin is 20cm , Find it's surface area . ( show the solution in steps ) ​

Answer 1

Step-by-step explanation:

Answer. 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

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Answer 2

Step-by-step explanation:

surface area of a coin is the same as the area of the circle

so,

area = 22/7 x r^2

given radius = 20cm

area = 22/7 x 20 x 20

        = 8800/7

        = 1257.142 sq.cm (approximately)