| A | B |
|---|
| point | A place in space. |
| line | A set of points. |
| plane | A flat surface. |
| ray | A line that starts at a point. |
| line segment | A line that has two end points. |
| parallel line | Lines that do not cross on a plane. |
| perpendicular | Lines that create at least one right L. |
| angle | The union of two end rays with a common point |
| rectangle | A parallelogram with a right angle. |
| square | A rectangle with all sides of equal length. |
| trapezoid | A quadrilateral with at least one pair of parallel sides. |
| point of intersection | Where two line have a point in common. |
| congruent | Two angles that have the same measure. |
| protractor | An instrument used to measure angles and to draw angles haveing a given measure. |
| vertical angles | A pair of nonadjacent angles formed .by two intersecting lines. |
| adjacent angles | Two angles that have a common side and nonoverlapping interiors. |
| directed angle | Angles which specify an initial and final side and a direction of turn. |
| regions | The interior and exterior of a simple closed curve. |
| polygonal curve | A curve that consists of a union of finitely many line segments. |
| polygon | A simple closed polygonal curve. |
| polygon region | The interior of a polygon. |
| convex polygon | A polygon whose interior is convex. |
