Circles and terms related to them

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Presentation transcript:

Circles and terms related to them

Pi Video http://www.bing.com/videos/search?q=math+bites&qpvt=math+bites& view=detail&mid=9D4A34A7367BD69C4A779D4A34A7367BD69C4A77& FORM=VRDGAR

Circle A set of points equal in distance from a given point, called the center.

Radius A line segment connecting the center of the circle to a point on the circle.

Diameter A line segment which goes through the center of the circle and connects two points on the circle.

Chord A line segment which connects two points on a circle. Can a diameter be considered a chord?

Central angle An angle whose vertex is the center of a circle

Arc Piece of a circle

Formula for circumference C = 𝜋𝑑 or C = 2𝜋r So if r = 3 in.

Formula for area of a circle So if r = 3 in