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Circles
Circle Properties
Term | Definition |
---|---|
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 |