if the perimeter of a semicircular protractor is 36 CM then find its diameter?
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perimeter of a semicircular protractor
= perimeter of a semicircle = (2r+πr)cm [given]
2r+πr=36
diameter = 2r =2×7=14cm
so, the diameter of a semicircle protector is 14 cm .
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10304:
why we are adding 2r
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