A protractor is in the shape of a semicircle of diameter 28 cm. Taking π = 22/7, what is its perimeter?
Correct answer A. 72 cm
Explanation
Perimeter of a semicircle = πr + 2r = 22/7 x 14 + 28 = 44 + 28 = 72 cm. Leaving out the diameter gives only 44 cm.
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