There are two circles of different radius such that radius of the smaller circle is three ndash seve...........

Quantitative Aptitude ( CCS) Mensuration 2D

There are two circles of different radius such that radius of the smaller circle is three – sevens that of the larger circle. A square whose area equals 3969 sq cm has its side as thrice the radius of the larger circle. What is the cicumference of the smaller circle?

55.2 cm

56.5 cm

25.36 cm

59.5 cm

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Explanation:

Side of square = √3969 = 63 cm
So radius of larger circle = 1/3 * 63 = 21 cm
So radius of smaller circle = 3/7 * 21 = 9 cm
So circumference of smaller circle = 2 * 22/7 * 9= 56.5 cm

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