| A | B |
|---|
| base angles of a trapezoid | If trapezoid ABCD has bases AB and CD, then there are two pairs of base angles: ÐA and ÐB, and ÐC and ÐD. |
| bases of a trapezoid | The parallel sides of a trapezoid. |
| diagonal of a polygon | A segment that joins two nonconsecutive vertices of a polygon. |
| isosceles trapezoid | A trapezoid with congruent legs. |
| legs of a trapezoid | The nonparallel sides of a trapezoid. |
| midsegment of a trapezoid | The segment that connects the midpoints of the leges of a trapezoid. |
| parallelogram | A quadrilateral with both pairs of opposite sides parallel. |
| polygon | A plane figure that is formed by three or more segmentss called sides. |
| rectangle | A parallelogram with four right angles. |
| rhombus | A parallelogram with four congruent angles. |
| square | A parallelogram with four congruent sides and four right angles. |
| trapezoid | A quadrilateral with exactly one pair of parallel sides called bases. The nonparallel sides are the legs. |
| vertex of a polygon | The intersection of two sides of a polygon. |
