Discussion
What is the surface area of a sphere of radius 7 cm ? (Take \(\pi = 22/7\))
Answer: C
Correct answer: 616 sq. cm
\[\text{Surface area} = 4\pi r^2 = 4 \times \frac{22}{7} \times 49 = 4 \times 154 = 616 \text{ sq. cm}\]
Notice that this is exactly four times the area of a great circle of the sphere, which is a useful check.
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