quadrilateral
A polygon with four sides.
A quadrilateral is a polygon that has four sides and four vertices (corners). The sum of the angles of a quadrilateral is always 360 degrees.
There are several types of quadrilaterals, including:
1. Square: A square is a regular quadrilateral in which all four sides are equal in length and all four angles are right angles (90 degrees).
2. Rectangle: A rectangle is a parallelogram in which all angles are right angles. It has opposite sides that are parallel and equal in length.
3. Parallelogram: A parallelogram is a quadrilateral in which opposite sides are parallel and equal in length. The opposite angles are also equal in measure.
4. Rhombus: A rhombus is a quadrilateral in which all four sides are equal in length. The opposite angles are equal and the diagonals bisect each other at right angles.
5. Trapezium: A trapezium (also called a trapezoid) is a quadrilateral with one pair of sides parallel, but the other pair of sides are not parallel.
It is important to note that some polygons, such as squares and rectangles, are also considered quadrilaterals, as they have four sides and four vertices.
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