| A | B |
|---|
| right angle | A 90 degree angle. |
| equilateral triangle | A triangle with all sides equal. |
| vertex | The intersection point of two sides. |
| right triangle | A triangle with one internal angle equal to 90 degrees. |
| pentagon | A polygon with 5 sides and 5 angles. |
| square | A rectangle having all four sides of equal length. |
| 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. |
| radius | A straight line extending from the center of a circle to the surface. |
| line segment | One part of a line. |
| Line | A continuous extent of length. |
| point | A position in space. |
| rectangle | A quadrilateral with opposite sides parallel. |
| circle | A closed plane. |
| hexagon | A six sided figure |
| obtuse angle | An angle greater than 90 degrees. |
| ray | a straight that has an endpoint and extends forever in one direction |
| right angle | measures 90 degrees |
| straight angle | 180 degrees |
| reflex angle | measures between 180 and 360 degrees |
| parallel lines | never meet, always the same distance apart |
| polygon | many sided, 2-D, closed figure |
| octagon | eight sided figure |
