< A Guide to the GRE
Quadrilaterals
The angles of a quadrilateral add up to 360º. There are 6 key types:
| Square | Rectangle | |
|---|---|---|
| Four equal, 90º angles | ✓ | ✓ |
| Four equal sides | ✓ | ✗ |
| Rhombus | Parallelogram | |
|---|---|---|
| Opposing sides are parallel | ✓ | ✓ |
| Diagonal angles are equal | ✓ | ✓ |
| Adjacent angles add up to 180º | ✓ | ✓ |
| All four sides are equal | ✓ | ✗ |
Trapezoid
- One set of parallel sides
Kite
- Two sets of adjacent equal sides
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