In calculus, this shape names an alternative to Riemann sums and Simpson's rule for approximating definite integrals.  
In calculus, this shape names an alternative to Riemann sums and Simpson's rule for approximating definite integrals.  James Garfield famously proved the Pythagorean Theorem with one of these shapes divided into three triangles.  One of these can be isosceles when both legs are of equal length, and the area of one of these figures is equal to the height times the average of the two bases.  FTP, name this quadrilateral with one pair of parallel sides.
In calculus, this shape names an alternative to Riemann sums and Simpson's rule for approximating definite integrals.  
{Trapezoid}