quadrilateralsto

Quadrilaterals are four-sided polygons that are fundamental in geometry. They are defined by four straight sides and four vertices, where each side meets two others at the vertices. Quadrilaterals can be classified based on their angles and sides. A convex quadrilateral has all its interior angles less than 180 degrees, while a concave quadrilateral has at least one interior angle greater than 180 degrees. Special types of quadrilaterals include squares, rectangles, parallelograms, rhombuses, and trapezoids. Each of these has unique properties, such as equal sides, parallel sides, or right angles. Quadrilaterals are also used in various mathematical proofs and real-world applications, such as in architecture, engineering, and computer graphics. The study of quadrilaterals provides a basis for understanding more complex polygons and shapes.