| A | B |
|---|
| points on the same line are ___ | collinear |
| a point on a line and all points of the line to one side of it | ray |
| an angle whose measure is greater than 90 | obtuse |
| two endpoints and all points between them | line segment |
| a flat figure with no thickness that extends indefinitely in all directions | plane |
| segments of equal length are ___ segments | congruent |
| two noncollinear rays with a common endpoint | angle |
| the set of all points collinear to two points is a ___ | line |
| an angle whose measure is less than 90 | acute |
| lines that meet at a 90˚ angle are | perpendicular |
| two angles with a common side but no common interior points are | adjacent |
| points that lie in the same plane are | coplanar |
| two nonadjacent angles formed by two intersecting lines are ___ angles | vertical |
| in angle ABC, point B is the ___ | vertex |
