A Guide to the GRE/Quadrilaterals

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Quadrilaterals[edit]

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