**Quadrilaterals | Geometry (all content) | Math | Khan Academy**
https://www.khanacademy.org/math/geometry-home/quadrilaterals-and-polygons

Quadrilaterals only have one side more than triangles, but this opens up an entire new world with a huge variety of quadrilateral types. Learn about it here. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more.

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