The perimeter of a semicircular protractor is 72 cm. Its diameter is
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Answer:
28 cm
Step-by-step explanation:
Perimeter of Semicircle = r (π+2)
=> 72 = r (22/7 + 2)
or, 72 = r [(22+14)/7]
=> 72 = r x 36/7
Therefore, r = 72 x 7 / 36 = 2 x 7 = 14 cm,
This gives Diameter = 14 x 2 = 28 cm
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