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Question

If the perimeter of semi circular protractor is 108cm find the diameter of the protractor

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Solution

Perimeter=108cm

Pi x r +2r=108

r(22/7+2)=108

r(22+14/7)=108

r(36/7)=108

r=108x7/36

r=3x7

r=21cm

Therefore, d=2r

=2x21=42cm


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