Geometry
posted by Sarah .
A cylindrical can holds three equalsized balls perfectly. Which is larger, the can's height or the can's circumference?

Let the ball's radius be R.
The can's height is 6R.
The can's circumference is 2 pi R.
2 pi = 6.283.. > 6
Therefore, _____ 
Great question, one of my favourites.
I used to bring a tennisball can into class and challenge my students to give me a solution and explanation verbally.
Thanks drwls for the reminder.