1. A line l and a point P. We’ll construct a line perpendicular to l through P.
  2. Draw a circle with center P, large enough to intersect with l in points A and B.
  3. Draw a new circle with center A, through B.
  4. Draw another circle, now with center B, through A.
  5. Construct the intersections C and D of these two circles.
  6. Connect C and D to construct the perpendicular.

Forming Wisdom