Common tangents

Draws every line that touches both of two circles. Ruler and compass only.

All parts

Part 1 of 7: Helper circle of radius c2 - c1 about QStep 1 of 11Ruler

Take the small radius off the big one. Lay the ruler from Q across c2.

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