Here's the proof diagram.

This figure shows the solution; refer to it as you work through the following steps.

**Using your straightedge, draw a working line,***l*, with a point*P*anywhere on it.**Put your compass point on point**The best way to make sure you've opened it to just the right amount is to draw a little arc that passes through*M*and open it to the length of line*MN*.*N.*In other words, draw arc (*M*,*MN*).**Being careful not to change the amount of the compass's opening from Step 2, put the compass point on point***P*and construct arc (*P*,*MN*) intersecting line*l*.

*Q,*and you're done.