5. A copper wire when bent in the form of a square encloses an area of 121 cm? If the same wire is bent into the form of a circle, find the area of the circle.
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Explanation:
The perimeter of square and circle is the same.
4a = 2πr
Given, area of square = a2 = 121 cm2
a = 11 cm
2πr = 4 × 11 cm
r = 7 cm
Area of circle = πr2
= 22/7 × 7 × 7 = 154 cm2
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