Area Problems
If the radius of a circle is decreased by 50% , find the percentage decrease in its area.

35%
65%
25%
75%

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Area Problems
A park is in the form of a square one of whose sides is 100 m . The area of the park excluding the circular lawn in the centre of the park is 8614 m 2. The radius of the circular lawn is?

21 m
None of these
41 m
31 m

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