A sector of a circle has radius 6 cm and angle 90 degrees. What is the length of its arc? (Give the answer in terms of pi.)
Answer and explanation
Correct answer: B. 3 pi cm
- Step 1: Arc = (angle/360) x 2 x pi x r.
- Step 2: = 90/360 x 2 x 6 x pi = 3 pi cm.
Answer
3 pi cm.
Why not the others: 9 pi cm, 12 pi cm and 6 pi cm do not fit.
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