In 2 dimensions, triangles and all polygons with 5 or more sides (pentagons, hexagons, heptagons etc); also, circles, ellipses, cycloids, irregular shapes.
Also all 3-dimensional shapes and, for the pure mathematician, any shape in more than 3 dimensions.
quadrilateral's are 4 sided 2-dimensional shapes xxx
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triangle
squarerhombusdiamondrectangle
Quadrilateral.
A quadrilateral.
A regular quadrilateral is a a four sided shape that has all of its sides equal in length. There are two shapes that satisfy these conditions, a square and a rhombus.