| A | B |
|---|
| quadrilateral | Four-sided polygon |
| diagonal | segments which connect any two nonconsecutive vertices |
| parallelograms | quadrilateral with both pairs of opposite sides parallel |
| rectangle | quadrilateral with four right angles |
| rhombus | quadrilateral with four congruent sides. |
| square | quadrilateral that is both a rectangle and rhombus. |
| trapezoid | quadrilateral withexactly one pair of parallel sides. |
| bases | parallel sides on a trapezoid |
| legs | nonparallel sides on a trapezoid |
| isosceles trapezoid | if legs are congruent on the trapezoid. |
| median of trapezoid | segment that joins the midpoints of the legs |
