Engineering Board Exam Reviewer · Angles and Trigonometric Functions · medium
A circular sector has a radius of 10 m and a central angle of 72°. Find its area in square meters.
- 20 π 62.83
- 40 π 125.66
- 10 π 31.42
- 25 π 78.54
Answer
A. 20 π 62.83
Solution
A= 12r2 = 12(10)2≤ft(72°·π/180° )= 12(100)≤ft(2π/5 )=20π 62.83 m2.
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