Quadrilateral

A quadrilateral is a four-sided polygon with straight sides. It has four angles and four vertices (corners). The sides can be of different lengths and angles can vary, allowing for shapes like squares, rectangles, trapezoids, and rhombuses. The total of all interior angles in any quadrilateral always adds up to 360 degrees. Quadrilaterals are common in everyday structures and designs, and their properties are studied in geometry to understand their shapes, sizes, and relationships between sides and angles.