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If the perimeter of a semi-circular prot...

If the perimeter of a semi-circular protractor is 108cm, find the diameter of the protractor.

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Let radius of protractor = r
perimeter of a semi-circular protractor = 108cm
`:. pi xx r = 108 cm`
` :. (22/7) xx r = 108 cm`
` :. r = 34.36 cm `
Diameter of protractor `= 2 xx r = 2 xx 34.36 = 68.72 cm `
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