Living Museum of Learning

Four questions, one imaginary number, and a missing bonus question

Subtitle: From √−48 to a 3D pulley system, one afternoon with Enning

Donald Sheng lost his first serious game of Golden Army to Cindy. And he couldn't have been happier.

Twenty triangle centers, four pentagons rendered, and a word Donald could barely keep to himself.

A pentagon, a golden ratio, nested square roots, and one pair of parentheses.

A soccer court, an old mathematical friend, and a journey from geometric construction to equations and three-dimensional creation.