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en.wikipedia.org/wiki/Quadrilateral

In Euclidean plane geometry, a

www.mathsisfun.com/quadrilaterals.html

www.khanacademy.org/math/basic-geo/basic-geometry-shapes/basic-geo-quadrilaterals/v/quadrilateral-overview

the rhombus is a slanted square and the parallelogram is a slanted rectangle.
they both are

www.khanacademy.org/math/basic-geo/basic-geometry-shapes/basic-geo-quadrilaterals/e/quadrilateral_types

Identify

thinkmath.edc.org/resource/shape-quadrilateral

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

A

mathworld.wolfram.com/Quadrilateral.html

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

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

A

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

Classification of

www.geom.uiuc.edu/docs/reference/CRC-formulas/node23.html

5.2

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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