quadrilateral
a polygon with four sides and four angles
A quadrilateral is a four-sided polygon. It is a closed figure with four straight sides and four angles. The sum of the interior angles of a quadrilateral is always equal to 360 degrees.
Quadrilaterals can be classified into different types based on different properties. Some of the common types of quadrilaterals are:
1. Parallelogram: A quadrilateral with opposite sides parallel to each other.
2. Rectangle: A parallelogram with all angles measuring 90 degrees.
3. Square: A rectangle with all sides of equal length.
4. Rhombus: A parallelogram with all sides of equal length.
5. Trapezium/Trapezoid: A quadrilateral with only one pair of parallel sides.
It is important to note that some types of quadrilaterals are also included in other types. For example, a square is both a parallelogram and a rectangle. Similarly, a rhombus is both a parallelogram and a kite.
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