Circumference

Using circumference to find a circle's area. Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.

Find the distance around a circle (and then eat some pi)

Use shadows to measure the Earth's circumference!

This lesson will look at examples to give an explanation what circumference is and how to calculate approximate and exact circumference.

This lesson shows how to find the perimeter of shapes that involve circles. Almost like an application to the first video on Circumference.

How many formulas for Pi can I explain in six minutes?

This lesson will explain the meaning of perimeter, circumference and area with a few examples

This lesson demonstrates how to find the circumference of a circle given the radius or diameter.