Please help me with this. Fill in the blanks.
The height of the wheel is the ________ (diameter, circumference,radius,or area) of the circle. The distance traveled by the wheel when it goes all the way around one time is the _______(diameter, circumference,radius,or area) of the circle. To estimate the value of pi, ______(multiply or divide) the distance traveled by the wheel it goes all the way around by_____(two times its height, its height, its height squared, one-half of its height).