Learning Target

Use strategies to develop formulas for finding the circumference of a circle.

Sample Problem

C÷D=Π C=circumference D=Diameter Π=Pi

Lesson

To find the circumference of a circle, you can take a piece of string and wrap it around the perimeter of it once, then measure the string. To find the diameter, take the string and hold it across the widest part of the circle. This can be defined as follows: C/D. Then divide the circumference by the diameter to get Pi (however, you will not get exactly Pi, but somewhere close). Pi is the quotient.