A wire is in the shape of a square of side 9 cm. If the wire is bent and shaped in the
form of a semi-circle, find the radius of the semi-circle so formed.
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Answer:
√51.54
area of square = 9*9
= 81cm²
area of square =. area of semi circle
area of semi circle= 81cm²
81=1/2*22/7*r*r
r² = 81*7/11
r = √51.54
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