GC 06 - Copy A Given Angle

The following technique shows how to copy an angle (on a piece of paper):

Needed analogue tools:

• Dividers

• Pencil

• Straight Edge

• Eraser

---

Given:

• Angle A-B-C

Desired:

• Copy Of A-B-C

1. Using your dividers, draw an arch with center at B and arbitrary radius.

2. Mark the first intersection as e.

3. Mark the second as b.

4. Stretch the divider's legs as wide as the e-b distance.

5. Draw a line at random length and direction and mark points D and E on it. D is at the end of the line.

6. Draw an arch with center D and radius B-e (as in Step 1).

7. Mark point h at the intersection of the arch and line D-E.

8. Using h as a center, draw another circle/arch with radius that equals that of e-b (Step 4).

9. Mark as i the intersection of the two arches/circles (Step 6 & 8).

10. Finally, connect D and i to form a new line D-i.

The D-i line together with D-E form an angle that equals A-B-C.

---

You can download the CAD and GH (Rhino/Grasshopper) files here:

06_Copy_Given_Angle.dwg

Download DWG • 87KB