Definition: A quadrilateral is a polygon with 4 sides. A diagonal of a quadrilat- eral is a line segment whose end-points are opposite vertices of the quadrilateral. So we can name the quadrilateral as ABCD, or quadrilateral BCDA, or ADCB. Definition: A Trapezoid is a quadrilateral with a pair of parallel sides.

### What is a quadrilateral shape?

Meaning. A quadrilateral is a polygon that has exactly four sides. (This also means that a quadrilateral has exactly four vertices, and exactly four angles.) The usual definitions of polygons, however, refer only to the line segments that form the edges of the polygon.

A quadrilateral is a four-sided polygon, like a square, rectangle, or rhombus. The most common type of quadrilateral is the square, but rectangles and rhombuses are quadrilaterals too. Quadrilaterals are also called quadrangles and tetragons. When you see the word quadrilateral, think “four sides”.

In geometry, a quadrilateral can be defined as a closed, two-dimensional shape which has four straight sides. The polygon has four vertices or corners. We can find the shape of quadrilaterals in various things around us, like in a chess board, a deck of cards, a kite, a tub of popcorn, a sign board and in an arrow.

## How do you know if a shape is a quadrilateral?

A Quadrilateral has four-sides, it is 2-dimensional (a flat shape), closed (the lines join up), and has straight sides….A quadrilateral has:

1. four sides (edges)
2. four vertices (corners)
3. interior angles that add to 360 degrees: