the diameter of a coin is 4.2 cm find its surface area
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4.2 / 2 = 2.1
And area = pie radius ^2
area = 22/ 7 2.1 × 2.1 = 4. 41
22/ 7×4.41= 13.26
Answer:
Surface area of coin is 0.0027 m²
Explanation:
It is given that,
Diameter of a coin is 4.2 cm. The radius of coin is equal to its diameter divided by 2. So, radius of coin, r = 2.1 cm = 0.021 m
The space occupied by an object is called its area. Surface area of coin is given by,
A = 0.0027 m²
Hence, the surface area of the coin is 0.0027 m²