AMC 10 Step by Step
2021 AMC Fall 10AProblem 22P21-25~9 minPrint

Inside a right circular cone with base radius 55 and height 1212 are three congruent spheres with radius rr . Each sphere is tangent to the other two spheres and also tangent to the base and side of the cone. What is rr ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.