weak trapezoids

A weak trapezoid is a figure, part of which consists of 3 sides that are part of a strong trapezoid (a strong trapezoid being a retronym for a traditional trapezoid) that includes the two bases, and whose remaining side is of arbitrary, but monotonic, shape. A great deal of mathematics consists of finding the area of a weak trapezoid (the areas of weak trapezoids traditionally being called ‘integrals’).
keywords: geometry