February 24, 2015

Problem of the Week

for Tuesday, February 24, 2015

A plastic cup has a circular top of radius 4 cm., a circular bottom of radius 3 cm., and a side length of 9 cm. Michael lays the cup on its side and rolls it on the floor. The top of the cup traces a circular path on the floor. What is the radius of this circle?

Winners of the rolling cup challenge