perimeter of semi circular protractor is 108 cm. Find the diameter of the protractor
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r{3.14+2}=108
r(5.14)=108
r=21cm
area =1/2πr^2
1/2×22/7×21×21
11×3×21
693cm^2
Radius=7/22*108=34.36
Diameter=68.72cm