Discussion
Find the area of circle whose radius is 7m?
Answer: B
\[ A = \pi r^{2} = \frac{22}{7} \times 7^{2} = \frac{22}{7} \times 49 \]
\[ = 22 \times 7 = 154 \text{ m}^{2} \]
A radius of 7 is chosen so that the 7 in \( \tfrac{22}{7} \) cancels cleanly. The circumference, a different quantity, would be \( 2\pi r = 44 \) m.
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