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A circle centered at P with radius 4 cm ...

A circle centered at P with radius 4 cm and another circle centered at Q with radius 16 cm toucheach other externally. A third circle with centre Ris drawn to touch the first two circles and oneof their common tangents as shown in the figure. Then, the radius of the circle with centre `R` is:

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A circle centered at P with radius 4cm and another circle centered at Q with radius 16cm toucheach other externally.A third circle with centre Ris drawn to touch the first two circles and oneof their common tangents as shown in the figure.Then,the radius of the circle with centre R is:

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