Quadrilaterals are four-sided polygons, and they come in various shapes. The common types of quadrilaterals include:
- Square: A quadrilateral with all four sides equal and all angles equal to 90 degrees.
- Rectangle: A quadrilateral with opposite sides equal and all angles equal to 90 degrees.
- Rhombus: A quadrilateral with all four sides equal but with angles that are not necessarily 90 degrees.
- Parallelogram: A quadrilateral where opposite sides are equal and parallel, but angles are not fixed at 90 degrees.
- Trapezoid (or Trapezium): A quadrilateral with at least one pair of parallel sides.
- Irregular Quadrilateral: A four-sided figure that does not have any specific properties of the other types.
Quadrilaterals can be classified based on their properties such as side lengths, angles, and parallel sides. Understanding these shapes is essential in geometry, as they form the basis for many other concepts.