| A | B |
|---|
| Triangle | Three sided polygon |
| Scalene Triangle | No equal sides |
| Right Triangle | One 90 degree angle |
| Isosceles Triangle | 2 equal sides |
| Acute Triangle | All angles are less than 90 degrees |
| Equilateral Triangle | 3 equal sides |
| Obtuse Triangle | 1 angle which measures more than 90 degrees. |
| Quadrilateral | A four sided polygon |
| Square | a rectangle with four congruent sides |
| Rectangle | a parallelogram with 4 right angles |
| Parallelogram | a quadrilateral with 2 pairs of parallel sides, opposite sides & angles are congruent |
| Rhombus | a parallelogram with all sides congruent |
| Trapezoid | a quadrilateral with one pair of parallel sides |
| Perimeter | the distance around a polygon (add all sides) |
| Circumference | the distance around a circle |
| Area | the number of square units needed to cover a given surface |
| Congruent | having the same size and shape |
