| Characteristics | Quadrilateral |
| Only one pair of parallel lines | |
| Two pairs of parallel lines, four right angles, and four congruent sides | |
| Two pairs of parallel lines, four congruent sides | |
| What is the sum of the measures of the angles in a quadrilateral? | |
| What is the measure of one angle in a square? | |
| What is the measure of one angle in a rectangle? | |
| What is the sum of the measures of the angles in a triangle? | |
| Two pairs of parallel lines | |
| Two pairs of parallel lines and four right angles | |