if the perimeter of a semi-circular protector is 66cm, the diameter of the protector is:
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Step-by-step explanation:
perimeter of protector=πr+ 2r
= 66= πr+2r
= 66= 22r/7 +2r
=66= 36r/7
r= 66x7/36
r= 462/36
d=2r
d=2x462/36
d=25.67
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