Area Problems
In a circle of radius 21 cm an arc subtends an angle of 72° at the centre. The length of the arc is?

26.4 cm
19.8 cm
21.6 cm
13.2 cm

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Area Problems
The radius of a circle is increased so that its circumference increase by 5%. The area of the circle will increase by?

10 %
10.5 %
10.25 %
8.75 %

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