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Video One: Radius and Diameter

Author: Shelly Hicks

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

Formula

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

Source: http://www.wyzant.com/resources/lessons/math/geometry/areas/circles_and_sectors

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