The serious video about circumference

A video about circles from the teacher you wish you had...

Circle Song... another one...

Circle Rap

Enjoy!

Circumference jingle

Don't you wish we did more jingles in class!

20.4 Circumference

borrowed from wikihow.com

Below is an explanation from aaamath.com

The circumference of a circle is the distance around the outside of the circle. It could be called the perimeter of the circle.

How to find the circumference of a circle:

• The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.
• If a circle has a diameter of 4, its circumference is 3.14*4=12.56
• If you know the radius, the diameter is twice as large.

Check your understand with the quiz at the bottom of this tutorial from mathgoodies.com

20.3 Draw a Diagram

The focus of this lesson is to be able to illustrate situations in order to help you find solutions to problems. DRAW A PICTURE

20.2 Perimeter

Find the perimeter by adding up all the external (outside) sides. Watch the video for examples of increasingly difficult problems