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 area of circle inscribed in an equilateral triangle is 154 sq cm. What is the perimeter of the triangle?

21 cm
42 cm
21?3 cm
42?3 cm

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