| A | B |
|---|
| line | It is straight and consists of a set of points that goes on forever in opposite directions. |
| line segment | It is part of a line between two endpoints. |
| ray | It is the part of a line that starts at an endpoint then goes on forever in one direction. |
| intersecting lines | Lines that meet at a common point. |
| parallel lines | Lines that never meet. |
| angles | It is formed by two rays that start at the same point. |
| perpendicular lines | Lines that intersect at square corners. |
| right angle | It forms a square corner. |
| acute angle | It is less than a right angle. |
| obtuse angle | It is greater than a right angle. |
| polygon | Any closed flat figure with straight sides. |
| quadrilateral | Any polygon with four straight sides. |
| parallelogram | A quadrilateral that has opposite sides that are parallel and equal. |
| right triangles | Triangles that have one right angle. |
| isosceles triangles | Triangles that have two sides that are equal length. |
| equilateral triangles | Triangles that have all three equal sides. |
| scalene triangles | Triangles that have no equal sides. |
