To illustrate the Pythagorean Theorem, makers of geometric models have long made models with pieces that could be arranged either as a square with a side equal to the length of the hypotenuse of a ...

Click to open image viewer. Hinged Plane Dissection, Two triangles and one quadrilateral that can be arranged as two different triangles or a quadrilateral. CC0 Usage Conditions ApplyClick for more ...

THIS is a really capital book for students of what may be called scholarship standard. It contains, among other things, sections on similarity, transversals, vector geometry, inversion, and coaxal ...

THE authors of these two volumes (obtainable also as a single book) regard the teaching of geometry as divisible into four stages. The first consists of little more than instruction in the use of ...