Drawing b is the best drawing.
Work Step by Step
For starters, we need a drawing that has a vertex that is at the origin. Thus, we narrow it down to drawing a and drawing b. Since we are going to need to use the distance formula for the distance between the midpoint of the hypotenuse and the vertex opposite the hypotenuse, we want the vertex opposite the hypotenuse to be the origin. Thus, option b is the best.