A maths professor shared a quiz on social media that begins with a drawing of a small triangle within another bigger triangle ...

There’s a new book out this week, a biography of Roger Penrose by Patchen Barss, with the title The Impossible Man: Roger Penrose and the cost of genius. Penrose is one of the greatest ...

And depending on the manner in which geometric information is presented, interpreting objects in the exact way a teacher intended may be next to impossible. Consider the two figures shown below.