Question: A sphere has a radius of 7 cm. What is the surface area of the sphere?
(A) 196π cm²
(B) 392π cm²
(C) 490π cm²
(D) 784π cm²
Solution:
The surface area 𝐴 of a sphere is given by:
A=4πr²
Given r=7 cm:
A=4π ×7² =4π×49= 196π cm²
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