Nine-point circle

Draws the circle through the midpoints of a triangle's sides and the feet of its altitudes. Ruler and compass only.

All parts

Part 1 of 7: Midpoint of BCStep 1 of 11Compass

The circle passes through the middle of each side. Put the point of your compass on B.

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