Geometry Ch. 1 Sect. 4
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Created by:
swimmerchick on September 8, 2010
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11 terms
Terms | Definitions |
|---|---|
 angle | consists of 2 different rays with the same endpoint |
| parts of an angle | sides (2 rays), vertex ( common endpoint) |
| how to name an angle | 1. use vertex letter 2. use 3 letters with vertex in the middle (ABC/ CBA) |
| protractor postulate | consider ray OB and a point A on one side of OB. the rays OA can be matched one to one with the real numbers 0-180. this allows us to measure angles |
| acute | measures between 0-90 degrees |
| obtuse | measures between 90-180 degrees |
| straight | measures 180 degrees |
| right | measures 90 degrees |
| angle addition postulate | if P is in the interior of angle RST, then the measure of angle RSP and the angle of PST equals the measure of angle RST (RSP+PST=RST) |
| congruent angles | 2 angles are congruent if they have the same measure |
| definition of angle bisector | a ray that divides an angle into 2 congruent angles can only be a ray |
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