| A | B |
|---|
| space | the set of all points |
| collinear points | points that all lie in one line |
| coplanar points | points that all lie in one plane |
| noncollinear points | points that do not all lie in one line |
| noncoplanar points | points that do not all lie in one plane |
| intersection of two figures | set of points that are in both figures |
| congruent figures | two objects that have the same size and shape |
| congruent segments | segments that have equal lengths |
| midpoint of a segment | point that divides the segment into two congruent segments |
| bisector of a segment | figure that intesects the segment at its midpoint |
| vertex of an angle | common endpoint of two sides of an angle |
| acute angle | angle whose measure is between 0 and 90 degrees |
| obtuse angle | angle whose measure is between 90 and 180 degrees |
| right angle | angle whose measure is 90 degrees |
| straight angle | angle whose measure is 180 degrees |
| congruent angles | angles that have equal measures |
| adjacent angles | two angles in a plane that have a common vertex and common side but no common interior points |
| bisector of an angle | the ray that divides the angle into two congruent adjacent angles |
| angle | two rays with the same endpoint |
