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Find the perimeter of a semicircular protractor whose diameter is 14 cm.
Given:
Diameter of the semicircular protractor = 14 cm
Radius of the protractor = cm = 7 cm
∵ Perimeter of semicircle = πr + d
∴ Perimeter of semicircular protractor = × 7 + 14 = 22 + 14
= 36 cm
Hence, the perimeter of the semicircular protractor is 36 cm.