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Video Four: How to Find the Circumference?

Video Four: How to Find the Circumference?

Author: Shelly Hicks
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Tutorial

Video also on You Tube

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Click here to see the video on You tube if you can not view the video below.

 

The address is http://www.youtube.com/watch?v=8R_6NU6ErSY&feature=youtu.be

Finding Circumference

Circumference

Key Ideas:

Circumference is the distance around a circle (it is like the perimeter of the circle)

 

 

To estimate the circumference:

 we would use C = 3 X diameter or C = 6 X radius

 

 

To find an better or more exact value for circumference we use:

C space equals space straight pi space cross times space straight d

Circumference = 3.14 X diameter

OR

C space equals space straight pi space cross times space 2 space cross times space straight r space space space left parenthesis but space math space people space like space to space write space this space as space straight C space equals space 2 πr right parenthesis

Circumference = 3.14 x 2 x radius