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ABP
Try it on the Geometry BoardUses:Parallel through a point

Parallel line

Draws the line through a point that runs alongside a line and never meets it. Ruler and compass only.

Part 1 of 1: Parallel through PStep 1 of 12Pencil

This draws the line through P that never meets f. Mark any point on f. Call it X.

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