| A | B |
|---|
| Equilateral Triangle | A triangle in which all sides are the same length. |
| Isosceles Triangle | A triangle in which two sides are the same length. |
| Scalene Triangle | A triangle that doesn't have any sides equal in length. |
| Right Triangle | A triangle that has one 90 degree angle. |
| Acute Triangle | A triangle in which all three angles are less than 9o degrees. |
| Obtuse Triangle | A triangle that has one angle greater than 90 degrees. |
| Sum of all angles in a triangle | 180 degrees |
| Sum of all angles in a quadrilateral | 360 degrees |
| Quadrilateral | Any polygon with 4 sides. |
| Parallelogram | Both pairs of opposite sides are equal in length and parallel. |
| Trapezoid | Has only one pair of parallel sides. |
| Rectangle | Both pairs of opposite sides are equal in length and parallel and has four right angles. |
| Rhombus | Both pairs of opposite sides are parallel and all sides are equal. |
| Square | Both pairs of opposite sides are parallel and all sides are equal. Also has four right angles. |
| Polygon | A closed plane figure made up of line segments. |
