You are constructing a tangent line from a point outside a given circle to the circle. You have drawn the circle, a point outside the circle and connected the center of the circle to the point outside

You are constructing a tangent line from a point outside a given circle to the circle. You have drawn the circle, a point outside the circle and connected the center of the circle to the point outside the circle. You found the midpoint of the segment and labeled it M. Next you must use your compass. What should you use to set it?