Video One: Radius and Diameter

Video One: Radius and Diameter

Author: Shelly Hicks
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Investigating Circles

Key Ideas:



Circle:  a closed curve

Radius: The distance from any point on a cirocle  the center of the circle.  In math, radius = r

Radii:  the plural form of radius

Diameter:  The distance between two points on a circle, through the center of the circle.  In math diameter = d



r a d i u s space left parenthesis r right parenthesis space equals space d over 2 space o r space d divided by 2
d i a m e t e r space left parenthesis d right parenthesis space equals space r space cross times 2

If the video below is not working, I have posted the video on You tube

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or the address is http://www.youtube.com/watch?v=uxQdDmAi7T8&feature=youtu.be