if perimeter of a semicircular protractor is 36 cm tjen its diameter will be?
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Answer:
Perimeter of semicircle= πr+2r
perimeter is 36cm
36=22/7r+2r
36=22r+14r/7
36=36r/7
r=36×7/36
r=7
Diameter=2×7
=14.
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