Question: A sphere has a radius of 7 cm. What is its surface area? (Use 𝜋 = 22⁄7)
a) 308 cm²
b) 616 cm²
c) 484 cm²
d) 154 cm²
Solution:
Surface area of a sphere = 4𝜋r².
4×22⁄7×7² = 616 cm²
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