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Circles

Circle Properties

TermDefinition
Minor Arc Arc with a measure less than 180 degrees
Major Arc Arc with a measure of more than 180 degrees
Semi-circle Half a circle; Arc with a measure of 180 degrees
Central Angle Angle whose vertex is the center of the circle
Inscribed Angle Angle whose vertex is on the circle
Tangent A line that touches the circle in exactly one point
Chord A segment whose endpoints are on the circle
Secant A line that crosses a circle twice
Intercepted Arc arc formed by angles or intersecting chords
Measure of intercepted arcs of central angle: arc measure is the same as angle measure of inscribed angle: arc measure is twice the angle measure
Vertical angles Angles formed by intersecting segments with a common vertex that are across from each other
Created by: fjohnson