A circle centered at P with radius 4 cm and another centered at Q with radius 16 cm touch each other externally. A third circle with centre R is drawn to touch the first two circles. they all have a common tangent. Then the radius of the circle with centre R is

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Answers

2015-12-28T16:14:00+05:30
The radius of the cirlce is 6 cm
1 4 1