If a wire is bent into the shape of a square, then the area of the. square so formed is 81cm2. When the wire is rebent into a semicircular shape, then the area, (in cm2) of the semicircle will be
Area of square of side 'a' = 81 i.e. a = 9cm
length of this wire will be = 4a = 36cm
perimeter of square = perimeter of semi-circle
36 = πr + 2r
r = 7cm
Area of semi-circle = $$\frac{1}{2}\pi r^{2}$$ = $$\frac{1}{2}\pi 7^{2}$$ = 77
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