If you fail, never give up because FAIL means 'First Attempt In Learning'.— A. P. J. Abdul Kalam

Circles — quick quiz

5 real IOQM questions on Circles. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.

Question 1 of 2

HARD

Two circles with radii 5 and 12 are externally tangent to each other. A third circle is tangent to both circles and to their common external tangent. If this third circle lies between the two given circles, find its radius.