What polygons have 4 vertices?

All 4-vertex polygons are called “quadrilaterals” - these can be convex or concave - equilateral or irregular. Specific combinations of side lengths and angles give you squares, rectangles, parallelograms, rhombus, trapeziums, trapezoids and possibly others that I've long ago forgotten! read more

The type of polygon is described by the number of its sides, and vertices. In the general case, an n-gon is a polygon with n-sides in the same plane. Four-sided polygons (4-gons) are quadrilaterals. read more

A geometric shape with 4 sides and 4 vertices is a 4-sided figure, a quadrilateral . read more