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en.wikipedia.org/wiki/Quadrilateral

In Euclidean plane geometry, a

www.mathsisfun.com/quadrilaterals.html

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-polygons/v/quadrilateral-types-exercise

Identifying

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-polygons/e/quadrilateral_angles

Find missing angle measures in

www.cut-the-knot.org/Curriculum/Geometry/Quadrilaterals.shtml

Classification of

www.math.com/school/subject3/lessons/S3U2L3GL.html

A

www.regentsprep.org/regents/math/geometry/gp9/lquad.htm

A

mathforum.org/dr.math/faq/formulas/faq.quad.html

Formulas for finding the area, perimeter, etc. of a

www.sheppardsoftware.com/mathgames/geometry/shapeshoot/QuadShapesShoot.htm

Learn about

www.mathopenref.com/quadrilateral.html

The

Answer

A quadrilateral is any two dimensional, four-sided shape. Its sides must all be straight. Squares, rectangles and parallelograms are all different kinds of quadrilaterals.

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www.khanacademy.org

Identify

mathworld.wolfram.com

(If the points do not lie in a plane, the