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Question 111
A copper wire is bent in the form of square with an area of 121 cm 2. If the same wire is bent in the form of a circle, the radius (in cm) of the circle is
Solution
Area of square is $$121 = (l)^2$$ (where $$l$$ is length of side)
So length will be = 11
Total length of wire will be = 44
So when it forms a circle, perimeter will be equal to 44
Hence $$2\pi r$$ = 44
or $$r$$ = 7
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