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Area of a Circle

A wire is ben...

Question

A wire is bent in the form of a square of side $66 c m$ . It is cut and again bent in the form of a circle. The radius of this circle is:

A

21 c m

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B

84 c m

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C

42 c m

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D

7 c m

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Solution

The correct option is B $42 c m$
Perimeter of square = perimeter of circle
=> 4×66 = 2πr
=> r = 42cm

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