Radical centre

Marks the point that has equal power for three circles. Ruler and compass only.

All parts

Part 1 of 5: Radical axis of the first two (1 of 2)Step 1 of 12Pencil

Start with c1 and c2. c1 and c2 don’t cross, so a helper circle does the work. Mark a point U off the line of centres, between the circles.

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