The rules of ruler and compass

What you may do, and what you may not. Ruler and compass only.

All parts

Part 1 of 4: What you may useStep 1 of 1Look

You may use two things: a straight edge (a ruler with no markings) and a compass. And a pencil to mark points.

Why: No measuring is allowed. That's what makes these constructions exact: they don't depend on how well you read a scale.

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