Question

Which diagram shows the most useful positioning and accurate labeling of an isosceles trapezoid in the coordinate plane?

Answer 1

The third image, where the label are (a,b), (c,d), (-a,b), (-c,d).

Because that let's you know the lengths of the bases and height of the trapezoid..

For example, the base lengths are:

a - ( -a) = a + a = 2a

c - (- c) = c + c = 2c

height: b - d