2024 AIME II Problems/Problem 8

Revision as of 21:28, 8 February 2024 by Mineric (talk | contribs)

Torus T is the surface produced by revolving a circle with radius 3 around an axis in the plane of the circle that is a distance 6 from the center of the circle (so like a donut). Let S be a sphere with a radius 11. When T rests on the outside of S, it is externally tangent to S along a circle with radius $r_i$, and when T rests on the outside of S, it is externally tangent to S along a circle with radius $r_o$. The difference $r_i-r_o$ can be written as $\frac{m}{n}$, where $m$ and $n$ are relatively prime positive integers. Find m+n.