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A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus.

Move your mouse cursor over the figures at the right to learn more.

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 ·  Polygon basics

 ·  Triangles

 ·  Quadrilaterals

 ·  Area of polygons
    and circles


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Quadrilaterals