Ken's Puzzle of the Week
Square Root of a Line

1. Given a compass, a straightedge, and a line segment AB of length 3, draw a line segment with a length of the square root of 3.
2. Given a compass, a straightedge, a line segment AB of length "x", and a unit line segment YZ, draw a line segment with a length sqrt(x).

Source: Thane Larson, quoting Descartes.