A sector of a circle has radius 18 cm and angle 72 degrees. What is the length of its arc? (Give the answer in terms of pi.)
Answer and explanation
Correct answer: A. 7.2 pi cm
- Step 1: Arc = (angle/360) x 2 x pi x r.
- Step 2: = 72/360 x 2 x 18 x pi = 7.2 pi cm.
Answer
7.2 pi cm.
Why not the others: 64.8 pi cm, 36 pi cm and 14.4 pi cm do not fit.
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