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24. A circle centered at P woth radius 4 cm and another circle centered at Q with radius 16 cm touch each otger externally. A third circle woth centre R is drawn to touch the first two circle and one of their common tangent. Then the radius of the cirle R is

Answer» 24. A circle centered at P woth radius 4 cm and another circle centered at Q with radius 16 cm touch each otger externally. A third circle woth centre R is drawn to touch the first two circle and one of their common tangent. Then the radius of the cirle R is


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