A Guide to the GRE/Quadrilaterals

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