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2 years ago

The radius of a coin is 20 cm, find its surface area. (12.57 cm)

Mathematics

1 answer:

zmey [24]2 years ago

5 0

Answer:

Step-by-step explanation:

assume the coin is circular.

i think radius=2.0 cm

∵ 20 cm is too big for a coin.

i have calculated the area of both the surfaces.

area =2×πr²=2×π×2.0²=8 π=8×3.14=25.12 cm²

if only one surface then area=π×2²=4π≈12.57 cm²

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2 years ago

The radius of a coin is 20 cm, find its surface area. (12.57 cm)​

The radius of a coin is 20 cm, find its surface area. (12.57 cm)