A trapezoid, also known as a trapezium in some regions, is a four-sided polygon (quadrilateral) with at least one pair of parallel sides. The parallel sides are referred to as the bases, while the non-parallel sides are called the legs. Trapezoids can vary in shape, including right trapezoids, where one leg is perpendicular to the bases, and isosceles trapezoids, where the legs are equal in length. The area of a trapezoid can be calculated using the formula: ( \text{Area} = \frac{1}{2} \times (b_1 + b_2) \times h ), where ( b_1 ) and ( b_2 ) are the lengths of the bases and ( h ) is the height.