Geometry Chapter 9 Section 1 Circles. Circle The set of all points in a plane that are a given distance from a center point Radius a line segment from.

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C=π d C=2πr r=½d d=rx2 A=πr² The diameter is the longest chord. The ratio of the circumference is always …. π is a Greek letter. π can also.
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Presentation transcript:

Geometry Chapter 9 Section 1 Circles

Circle The set of all points in a plane that are a given distance from a center point Radius a line segment from the center point to the edge (on the) of a circle Diameter A line segment that has both endpoints on the circle and passes throough the center point

Circle Center Point radius Diameter

Circle Chord: a line segment with both endpoints on the circle Circumference: distance around the circle the ratio of the circumference to the diameter of a circle

All Radii are congruent W E G F J

Exact Circumference the circumference measured in terms of π If D = 12 then C = 12π If r = 8 then C = 16π

Name a Circle with it’s Center Point G Circle G

Name The circle 2 chords 2 radii a diameter W E G F J

Given Circle W Name If WF = 5 Find the measure of FG W E G F J

Do Now Page – 8,

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