| 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. |
| square | quadrilateral, opposide sides parallel, four congruent sides, four right angles |
| 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. |
| rectangle | A quadrilateral with opposite sides parallel and congruent, four right angles. |
| obtuse angle | An angle measuring between 90 and 180 degrees. |
| straight angle | An angle measuring 180 degrees |
| congruent | Having the same measurement |
| Quadrilateral | A four sided figure |
| Parallelogram | A quadrilateral with opposite sides parallel and congruent |
| Rectangle | A quadrilateral with opposide sides parallel and congruent, four right angles |
| Square | A quadrilateral with four congruent sides, opposide sides parallel and four right angles |
| Rhombus | A quadrilateral with opposide sides parallel and four sides congruent |
| Trapezoid | A quadrilateral with only one pair of parallel sides |
