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Video Four: How to Find the Circumference?

Author: Shelly Hicks

Video also on You Tube

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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

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

Circumference = 3.14 x 2 x radius