| A | B |
|---|
| scalene triangle | A triangle with no sides with the same lenght. |
| right angle | An angle with a measurement of exactly 90 degrees. |
| acute triangle | A triangle with 3 acute angles. |
| obtuse angle | An angle with a measurement of more than 90 degrees but less than 180 degrees. |
| line segment | A part of a line that connects two endpoints. |
| acute angle | An angle with a measurement of less than 90 degrees. |
| right triangle | A triangle with one right angle. |
| straight angle | An angle with a measurement of 180 degrees. |
| polygon | A closed figure than can be drawn without lifting your pencil, made up of line segments that do not cross each other. |
| line | A set of points that form a straight path that goes on forever in both directions. |
| ray | A part of a line that has one endpoint and continues in one direction without end. |
| angle | A figure formed by two rays or line segments with the same endpoint. |
| scalene triangle | A triangle with no sides the same length. |
| vertex | The common point of the two rays of an angle. |
| degree | A unit for measuring angles. |
| intersecting lines | Lines that meet or cross at a common point. |
| perpendicular lines | Intersecting lines that cross each other at right angles. |
| parallel lines | Lines that are in the same plane that never intersect. |
| equilateral triangle | A triangle with three sides of the same length. |
| isosceles triangle | A triangle with no sides the same length. |
| obtuse triangle | A triangle with one obtuse angle. |
