Anonymous
A 4-sided solid 3-d figure is also called a "tetrahedron". A tetrahedron is one of the shapes that is also known as a "platonic solid". -
A four-sided figure would be a square. It would look just like a box in 3D!
Any four-sided shape is a Quadrilateral.
Quadrilateral, from the Latin four sides Quadrilateral.
4 sided geometric figures are called quadrilaterals. !
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