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ABCDX
Try it on the Geometry BoardUses:Copy an angle

Spiral similarity

Turns and scales an object by the spiral similarity that takes A to C and B to D. Ruler and compass only.

All parts
Part 1 of 5: Copy angle BAX at C, along ray CD (1 of 2)Step 1 of 7Compass

The image makes the same angle with CD. Put the point of your compass on A.

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