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K Sengupta
Posts:
114
From:
INDIA
Registered:
1/10/06


A Three Circle Problem
Posted:
Oct 24, 2006 10:09 PM


Three circles of radius d are drawn on the surface of a sphere of radius r. Each pair of circles touches externally and the three circles all lie in one hemisphere. Determine the radius of a circle on the surface of the sphere which touches all three circles.



