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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.

In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, ...

## Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid - Math is Fun

Quadrilateral just means "four sides" (quad means four, lateral means side). A Quadrilateral has four-sides, it is 2-dimensional (a flat shape), closed (the lines ...

## Intro to quadrilateral | Quadrilaterals | Shapes | Basic geometry ...

Learn the term quadrilateral as well as trapezoid, parallelogram, rectangle, rhombus, and square.

Quadrilaterals only have one side more than triangles, but this opens up an entire new world with a huge variety of quadrilateral types. Learn about it here.

Classification of Quadrilaterals. Quadrilateral is a geometric shape that consists of four points (vertices) sequentially joined by straight line segments (sides).

## 5.2 Quadrilaterals - The Geometry Center

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

5.2 Quadrilaterals. The following formulas give the area of a general quadrilateral (see Figure 1, left, for the notation). Figure 1: Left: notation for a general ...

## Identifying the Seven Quadrilaterals - dummies

A quadrilateral is a polygon with four sides. There are seven quadrilaterals, some that are surely familiar to you, and some that may not be so familiar. Check out ...