Points m and n are two of the vertices of a right triangle. they are the endpoints of the hypotenuse mn of the triangle. the third vertex lies in the fourth quadrant. plot a point at the location of the third vertex.

The triangle in the image below shows the RED line and 2 GREEN lines.

The RED line is the Hypotenuse MN

The two GREEN lines connect to form a right triangle to complete this triangle.

Point (5, -2) is the point on the fourth quadrant that is the third vertex of the right triangle.

ANSWER: (5,-2) is the 3rd vertex of the right triangle (graph shown)