02 Line Perpendicular To Given Line

1. Draw a line with convenient length and direction.

2. Draw a second line so as to cross the first one (with similar length).

3. Mark a point at the intersection, as shown.

4. Draw a circle using the compass.

5. The circle should intersect the two lines initially drawn. Mark at least 3 of the intersections as 5, 6, 7.

6. Using a straight edge and a pencil connect 5 with 6 to draw a line.

7. In a similar fashion connect 6 with 7.

8. Lines 5-6 and 6-7 form a 90 degree angle, if done correctly.

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You can also download the CAD and Grasshopper files:
01_True_Set_Of_Square.dwg
01_True_Set_Of_Square.gh