Exercise 2.17 - Perpendicular from a point on the line (with rusty compass)

Using a ruler and rusty compass, construct the perpendicular to a line I at a point A on l (par = 6).[br][br]4 circles + 1 line = 5 steps.
– Gianluca Occhetta

Information: Exercise 2.17 - Perpendicular from a point on the line (with rusty compass)