| A | B |
|---|
| right angle | A 90 degree angle. |
| equilateral triangle | A triangle with all sides equal. |
| scalene triangle | A triangle having three unequal sides and angles. |
| vertex | The intersection point of two sides. |
| right triangle | A triangle with one internal angle equal to 90 degrees. |
| intersecting lines | Lines that cross each other. |
| perpendicular lines | Two lines that cross each other to form a 90 degree angle. |
| acute angle | An angle less than 90 degrees. |
| line segment | One part of a line that has a beginning point and an end point. |
| line | Continues on forever in two directions |
| point | A position in space. |
| obtuse angle | An angle greater than 90 degrees. |
| reflex angle | An angles greater than 180 degrees and less than 360 degrees |
| parallel llines | lines that never intersect |
| congruent | equal |
| straight angle | an angle that measures 180 degrees |
| ray | part of a line that has one end point and goes forever in the other direction |
| bisect | cut in half |
| collinear | on the same line |
| coplanar | on the same plane |
