| A | B |
|---|
| quadrilateral | a polygon having four sides |
| trapezoid | a quadrilateral with exactly one pair of parallel opposite sides |
| parallelogram | a quadrilater with both pairs of opposite sides parallel and congruent |
| rectangle | a parallelogram with 4 right angles |
| rhombus | a parallelogram with 4 congruent sides |
| square | a parallelogram with 4 congruent sides and 4 right angles |
| scalene triangle | a triangle with no congruent sides |
| isosceles triangle | a triangle with 2 congruent sides |
