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How to draw a perpendicular on a line?
Start with two points defining the given line.

Determine the given point.

Draw an arc with its center at point 2 and a suitable radius. The arc must intersect line 1 twice at points with a suitable distance.

Draw an arc with its center at one of the intersections of line 1 and arc 3, with a suitable radius.

Repeat this for the other intersection. The radius must be equal to that of arc 4, and both arcs must intersect at the opposite side of line 1 relative to point 2.

Draw the line connecting point 2 to the intersection of arcs 4 and 5.

The part of line 6 from point 2 to the intersection of it with line 1 is the line to be constructed, perpendicular to line 1 and passing through point 2.


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