Do you recall your high school geometry? Given isosceles triangle ABC, where side AB is equal to side BC, then angle A is also equal to angle C. That’s not something your math teacher invented—it’s a ...

I first started teaching Geometry last year and have taken over "Informal Geometry" this year. As the name of the second class implies, the idea of formal proof is strongly de-emphasized; this class ...

It is often said that the most influential book in the history of Western thought is Euclid’s mathematical treatise “Elements.” The work of a Greek mathematician living in Alexandria around the year ...

OXFORD.—An important change has recently been made in the regulations for Responsions. The change affects the examination in the Elements of Geometry. Instead of Euclid's Elements Books i. and ii., ...