During courses on geometry it is sometimes necessary to draw a triangle on the blackboard that can easily be recognized as a general triangle. It must not be rectangular and must not have two or more equal angles. Further all angles should be less than $\pi/2$. Has anybody optimized this old problem of geometry-teachers?
Post Closed as "off topic" by Steven Landsburg, Carlo Beenakker, Fernando Muro, Henry Cohn, Andrés E. Caicedo