![]() ![]() So all other quadrilaterals are irregular. The only regular (all sides equal and all angles equal) quadrilateral is a square. Since these shapes appear in daily lives, they are easier to. and that's it for the special quadrilaterals. Definition: Rectangle is a four sided polygon whose opposite sides are equal and all its angles measure 90°. In the study of art, a shape is an enclosed space, a bounded two-dimensional form that has both length and width. The most common 3D shapes include a cube, a sphere, a cylinder, a rectangular prism, and a cone. definition rectangle quadrilateral parallelogram polygon right angles.
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