| A | B |
|---|
| point | basic unit of geometry, it has no size & is infinitely small |
| plane | undefined, flat surface of points with infinite length & width, no thickness |
| collinear | 2 or more points on the same line |
| coplanar | 2 or more points within the same plane |
| space | the set of all possible points |
| line segment | 2 endpoints & all points between them |
| ray | a 1-D figure with endpoint A, point B, & all points between and beyond B |
| degree measure | a unit of measure for angles |
| line | undefined, a straight arrangement of points |
| angle | 2 rays not on the same line that share a common endpoint |
| congruent | 2 geometric figures which are identical in size & shape |
| biconditional | a conditional statement and its converse which are both true |
| counterexample | an example that proves a statement wrong |
| right angle | an angle whose measure is 90 degrees |
| acute angle | an angle whose measure is less than 90 degrees |
| obtuse angle | an angle whose measure is greater than 90 degrees |
| midpoint | X is midpoint of segment AB if AX=XB |
| angle bisector | a ray that has an endpoint on the vertex of an angle & divides the angle into 2 congruent angles |
| parallel lines | 2 or more lines in the sameplane which do not intersect |
| perpendicular | 2 lines that intersect to form a right angle |
| complimentary | 2 angles whose measures have to sum of 90 degrees |
| supplementary | 2 angles whose measures have the sum of 180 degrees |
| linear pair of angles | If X, Y, and Z are collinear points & W is a point not on line XZ then angles XYW and WYZ form a linear pair of angles. |
| vertical angles | If lines AB and CD intersect at point P so that P is between points A & B and C & D, then angles APC & BPD are 1 pair of vertical angles. |
