What quadrilateral only has one pair of parallel es?

The quadrilateral you're looking for is called a trapezoid (or trapezium in some regions). This unique shape has one pair of parallel sides, which distinguishes it from other quadrilaterals like rectangles and parallelograms that have two pairs of parallel sides. The non-parallel sides can be of varying lengths, giving trapezoids a distinct slant and making them quite versatile in design! In real-world applications, trapezoids are frequently seen in architecture and design. For example, the shape of some bridges and the angles of certain rooftops utilize trapezoidal patterns to create stability and aesthetic appeal. Trapezoids also play a role in crafts and construction, often simplifying calculations for area and material usage in projects!