Math Open Reference
| After doing this | Your work should look like this | |
|---|---|---|
| Start with a line and point K on that line. |  |
|
| 1 | Set the compass width to a medium setting. The actual width does not matter. |  |
| 2 | Without changing the compass width, mark a short arc on the line at each side of the point K, forming the points P,Q. These two points are thus the same distance from K. |  |
| 3 | Increase the compass to almost double its width (again the exact setting is not important). |  |
| 4 | From P, mark off a short arc above K |  |
| 5 | Without changing the compass width repeat from the point Q so that the the two arcs cross each other, creating the point R |  |
| 6 | Using the straight edge, draw a line from K to where the arcs cross. |  |
| 7 | Done. The line just drawn is a perpendicular to the line at K |