Fermat point

Marks the first isogonic centre, where the lines to the far corners of outward equilateral triangles meet. Ruler and compass only.

All parts

Part 1 of 5: Equilateral triangle outward on BCStep 1 of 10Compass

Build it on the side away from A. Put the point of your compass on B.

Keys: left and right arrows step, Space plays or pauses, Escape goes back to all constructions.