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5.
A circular wire of radius 42 cm is cut and bent into the form of a rectangle whose sides are in the ratio of 6 : 5. The smaller side of the rectangle is
6.
The ratio of the areas of the incircle and circumcircle of a square is
7.
If the circumferences of two circles are in the ratio 4 : 9, then the ratio in their area is
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10.