What and what are examples of quadrilateral?

A quadrilateral is a polygon with four sides and four angles. Examples of quadrilaterals include:

1. Square: A quadrilateral with four equal sides and four right angles.
2. Rectangle: A quadrilateral with four right angles, opposite sides that are equal in length, and parallel sides.
3. Parallelogram: A quadrilateral with opposite sides that are parallel and equal in length.
4. Rhombus: A quadrilateral with four equal sides.
5. Trapezoid: A quadrilateral with one pair of parallel sides.

Definition of Quadrilateral:

A quadrilateral is a polygon with four sides and four angles.

Examples of Quadrilaterals:

- Parallelogram: A quadrilateral with opposite sides parallel to each other and equal in length. Examples: rectangle, square, rhombus.
- Trapezoid: A quadrilateral with exactly one pair of parallel sides. Examples: isosceles trapezoid, right trapezoid.
- Kite: A quadrilateral with two pairs of adjacent sides equal in length. Examples: diamond kite, delta kite.
- Rectangle: A parallelogram with four right angles.
- Square: A rectangle with four equal sides.
- Rhombus: A parallelogram with four equal sides and no right angles.
- Deltoid: A quadrilateral with four equal sides and no parallel sides.
- Concave Quadrilateral: A quadrilateral with at least one interior angle greater than 180 degrees.
- Convex Quadrilateral: A quadrilateral with all interior angles less than 180 degrees.