# 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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by haardik

i am giving more possibilities than given earlier.... there are two circles external to the given circles... then there are infinite circles that are enclosed with in the given two circles. Also there are infinite circles with radius R which are enclosing the given two circles.

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