Polygons: special types of quadrilaterals mostly.
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| 5443280 | Polygon | a closed plane figure bounded by straight sides | 0 | |
| 5443281 | triangle | a three-sided polygon | 1 | |
| 5443282 | pentagon | a five-sided polygon | 2 | |
| 5443283 | vertex | point where two line segments intersect[ | 3 | |
| 5443284 | diagonal | a straight line connecting any two vertices of a polygon that are not adjacent (opposite) | 4 | |
| 5443285 | consecutive angles | angles that share one side in common | 5 | |
| 5443286 | opposite sides | sides that do not intersect at the same vertice | 6 | |
| 5443287 | opposite angles | angles that are not composed of the same line segment of another angle | 7 | |
| 5443288 | quadrilateral | a four-sided polygon | 8 | |
| 5443289 | parallelogram | a quadrilateral where both pairs of opposite sides are parallel | 9 | |
| 5443290 | rectangle | a parallelogram with a right angle | 10 | |
| 5443291 | square | a rectangle with all sides congruent | 11 | |
| 5443292 | rhombus | a parallelogram with all sides congruent | 12 | |
| 5443293 | trapezoid | a quadrilateral with exactly one pair of opposite sides that are parallel | 13 | |
| 5443294 | isosceles trapezoid | a trapezoid with the non parallel sides congruent | 14 | |
| 5443295 | properties of a rectangle | shares all properties of a parallelogram and all angles are congurent and right, diagonals are congruent | 15 | |
| 5443296 | properties of a square | all properties of a rectangle are shared and all sides are congruent with diagonals being perpendicular bisectors of one another | 16 | |
| 5443297 | properties of a parallelogram | opposite sides are congruent, opposite angles are congruent, consecutive angles are supplementary, diagonals bisect one another | 17 | |
| 5443298 | properties of a rhombus | all properties of a parallelogram with all sides congruent and diagonals are perpendicular bisectors | 18 | |
| 5443299 | properties of an isosceles trapezoid | base angles are congruent, upper angles are congruent, the sum of any upper angle and base angle are supplementary, sides opposite the base angles are congruent. Diagonals are congruent | 19 | |
| 5443300 | kite | a quadrilateral that has 2 distinct pairs of consecutive congruent sides | 20 | |
| 5443301 | properties of a kite | diagonals are perpendicular bisectors | 21 |
