the the diameter of a coin is 4.2 cm. find its surface area
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Answer:
surface area of coin is 13.86cm2
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Pls mark as brainliest of it helps
Step-by-step explanation:
Let the height of the coin be h.
Diameter = 4.2 cm and radius = d / 2 = 2.1 cm
Surface area = 2 * pi * r * h + 2 * pi * (r)²
So,
3.14 * 4.2 * h + 2 * 3.14 * 2.1²
⇒ 13.88 h + 27.6048
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