Discussion
The perimeter of a semi circle is 144 cm then the radius is?
Answer: B
\[ P = r(\pi + 2) = r \times \frac{36}{7} \]
\[ 144 = \frac{36r}{7} \quad\Longrightarrow\quad r = \frac{144 \times 7}{36} = 28 \text{ cm} \]
Using \( \pi r \) alone would give \( r = 45.8 \) cm - the diameter is part of a semicircle's boundary and must be included.
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