Video and Examples
Learn how to find the circumference of a circle if you know the measure of the circle's diameter.
Find the circumference of this circle with a diameter of 8 inches. 
Find the circumference of this circle with a diameter of 35 inches. 
Find the circumference of this circle with a diameter of 8 inches in terms of $\large~\pi$. 
Use this applet to observe how to find the circumference of any circle using either 3.14 or and when given the radius or the diameter.

Selfcheck
Q1: What is the circumference of a circle with a diameter of 10 cm? (Use π = 3.14) [show answer]
Q2: What is the circumference of a circle with a diameter of 14 cm? (Use π = 3 1/7) [show answer]
Q3: In terms of π, what is the circumference of a circle with a diameter of 8 cm? [show answer]