Cartesian Coordinate Planes with segments drawn connecting points A, B, and C. These segments represent the sides of a right triangle. The coordinates of point A are left parenthesis x sub 1, y sub 1 right parenthesis. The coordinates of point B are left parenthesis x sub 2, y sub 2 right parenthesis. The coordinates of point C are left parenthesis x sub 2, y sub 1 right parenthesis. Segment A B represents the hypotenuse of the triangle which is also called d.