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CAT 2015 Quantitative Ability

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Question : 25

Total: 34

In the figure, O and O' are the centres of the bigger and smaller circles respectively and small circle touches the square ABCD at the mid point of side AD. The radius of the bigger circle is equal to 15 cm and the side of the square ABCD is 18 cm. Find the radius of the smaller circle.

4.25 cm
4.5 cm
4.75 cm
5 cm

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