Description:

1. Draw line BC

2. Draw a parallel to BC with the perpendicular distance of

3. Draw the perpendicular bisector of BC

4. Draw in B (or in C) the angle of (90° - <(A)) = 30° , that means <(MBC) = 30°

5. The arm of this angle crosses the perpendicular bisector in M.

6. Draw the circle around M with radius r = MB (or MC)

7. The intersection points of the circle and the parallel to BC are the points A.