Practise these constructions until you can do them without looking at the instructions. Follow the instructions and draw this perpendicular bisector of a line segment construction. Without changing ...

The six intersection points of a triangle’s non-parallel altitudes and perpendicular bisectors are the vertices of two congruent minor periambic triangles which are inversely similar to the original.

The Monthly publishes articles, as well as notes and other features, about mathematics and the profession. Its readers span a broad spectrum of mathematical interests, and include professional ...