Area Problems
The radius of a circle is so increased that its circumference increased by 5%. The area of the circle, then increases by

12.5%
10.25%
11.25%
10.5 %

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Area Problems
A person observed that he required 30 s time to cross a circular ground along its diameter than to cover it once along the boundary. If his speed was 30m/min, than the radius of the circular ground is (take ? = 22/7)

5.5 m
10.5 m
7.5 m
3.5 m

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