Flashcards: Circle Angles Formulas
About these flashcards
Created by:
peachdv on March 14, 2010
Subjects:
geometry vocabulary, geometry formulas
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Terms | Definitions |
|---|---|
 central angle rule | angle= arc |
| inscribed angle rule | angle= ½arc |
| radius drawn to Tangent at the point of tangency | radius ⊥ Tangent |
| angle formed by a tangent and a chord | angle = ½arc |
| angle formed by two secants | angle= ½( big arc - little arc) |
| angle formed by a secant and a tangent | angle= ½(big arc - little arc) |
| angle formed by two tangents | angle= ½(big arc - little arc) |
| angle formed by two chords | angle=½(chord+chord) |
| if two central angles are congruent... | chord≡chord & arc≡arc |
| if a diameter is ⊥ to a chord... | it bisects chord & bisects arc |
| line segment rule when two chords intersect | (DE)(EA)=(BE)(EC) (segment piece)×(segment piece) = (segment piece)×(segment piece) |
| line segment rule when two secants intersect | (PB)(PA)=(PC)(PD) (whole secant)×(external part) = (whole secant)×(external part) |
| line segment rule when a secant and tangent intersect | (PC)(PD)=(PA)² (whole secant)×(external part) = (tangent)² |
| line segment rule when two tangents intersect | PA=PB tangent=tangent |