quadrilateral
a four-sided polygon
A quadrilateral is a geometric shape that is defined as a four-sided polygon. It has four vertices (or corners), four sides, and four angles. The sum of its interior angles is always 360 degrees. Quadrilaterals are classified into different types based on their properties and characteristics, including the length of their sides and the measure of their angles.
The most common types of quadrilaterals are as follows:
1. Rectangle: A rectangle is a quadrilateral with four right angles. Its opposite sides are parallel, and all its angles are 90 degrees. The length of its sides can be different.
2. Square: A square is a quadrilateral with four congruent sides and four right angles. All its sides are equal in length, and each angle measures 90 degrees.
3. Rhombus: A rhombus is a quadrilateral with four sides of equal length. It has two pairs of opposite angles that are congruent but not necessarily right angles.
4. Parallelogram: A parallelogram is a quadrilateral with opposite sides that are parallel to each other. Its opposite angles are equal, but not necessarily right angles.
5. Trapezoid: A trapezoid is a quadrilateral that has one pair of parallel sides. The other two sides may be of different lengths.
Knowing the properties of each type of quadrilateral is important for solving problems in geometry where these shapes are used.
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