the diameter of a glass sphere is 3.5 CM then what is the value of its surface area?
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Diameter = 3.5 cm = 35/10 = 7 / 2
Radius = 7/2 /2 = 7 / 4
Surface Area = 4πr²
= 4 × 22/7 × 7/4 × 7/4
= 22 × 7 / 4
= 154 / 4
= 38.5
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