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circle words

center point The very middle of the circle, labeled with a dot
circumference the distance around the outside of a circle. Can be found by taking the diameter times pi
concentric circles circle within a circle that all share a common center
central angle an angle whose vertex is the center point and its sides are radii
radius a segment that starts anywhere on the circle and ends at the center point. It is half of the diameter
diameter a chord that passes through the center point
chord a segment that passes through the circle and its endpoints are on the circle
sector a part inside the circle bound by 2 radii and an arc
arc part of the circumference of the circle
inscribed angle an angle whose vertex is on the circle and the sides are chords in the circle
inscribed polygon a polygon inside of a circle whose vertices are on the circle
semi circle half of a circle, bound by an arc and the diameter
Created by: sfuehrer