Calculate the perimeter of a semi circle whose radius is 21cm
1 answer:
Radius of semicircle r = 21 cm
Perimeter of semicircle
= pi*r + 2r
= (22/7)*21 + 2*21
= 22*3 + 42
= 66 + 42
= 108 cm
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I believe that the answer is 20. I am not entirely sure though.
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