A=1/2(b1+b2)h - area of trapezoid
to find the height we need to look at the right triangle inside the trapezoid
in the right triangle longest diagonal is a hypotenuse, so we need to us Pythagorean theorem
to find the height we need to look at the right triangle inside the trapezoid
in the right triangle longest diagonal is a hypotenuse, so we need to us Pythagorean theorem