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Quadrilaterals are two-dimensional four-sided polygons on a plane.

Quadrilaterals have the following properties:

four sides,

two diagonals,

four internal angles (or vertices),

the interior angles add up to 360°.

The following diagram shows the properties of some quadrilaterals: square, rectangle, parallelogram, trapezoid, rhombus, kite. Scroll down the page for more examples on the properties of a quadrilaterals