The magic circle of circles, first developed by Benjamin Franklin, consists of eight annular rings and…

Squares that have many more summations than just rows, columns, and diagonals. Frost extended this idea…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

Illustration of a square constructed upon the sum of two straight lines.