AMC 10 Step by Step
2021 AMC Fall 10AProblem 19P16-20~7 minPrint

A disk of radius 11 rolls all the way around the inside of a square of side length s>4s>4 and sweeps out a region of area AA . A second disk of radius 11 rolls all the way around the outside of the same square and sweeps out a region of area 2A2A . The value of ss can be written as a+bπca+\frac{b\pi}{c} , where a,ba,b , and cc are positive integers and bb and cc are relatively prime. What is a+b+ca+b+c ?

Log in to save your progress.

Similar problems

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