Exams › SSC CGL (Prelims) › General

Two circles are similar and their radii are in the ratio 5 : 8. Find the ratio of the areas of the two circles.

1. 5 : 8
2. 25 : 64
3. 8 : 5
4. 64 : 25

Correct answer: 25 : 64

Solution

The area of a circle is pi*r^2, so the ratio of areas equals the square of the ratio of radii. Squaring 5:8 gives 25:64.

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