Constructing a perpendicular line

After doing this	Your work should look like this
	Start with a line and point R which is not on that line.
Step 1	Place the compasses on the given external point R.
Step 2	Set the compasses' width to a approximately 50% more than the distance to the line. The exact width does not matter.
Step 3	Draw an arc across the line on each side of R, making sure not to adjust the compasses' width in between. Label these points P and Q
Step 4	At this point, you can adjust the compasses' width. Recommended: leave it as is. From each point P,Q, draw an arc below the line so that the arcs cross.
Step 5	Place a straightedge between R and the point where the arcs intersect. Draw the perpendicular line from R to the line, or beyond if you wish.
Step 6	Done. This line is perpendicular to the first line and passes through the point R. It also bisects the segment PQ (divides it into two equal parts)