"If from any point on the circumference of a circle, a perpendicular be let fall upon a given diameter,…

Illustration showing a conchoid, "a curve, shell-like in flexure (whence the name), invented by Nicomedes…

"The volume of a frustum of a circular cone is equivalent to the sum of the volumes of three cones whose…

Diagram used to prove the theorem: "The volume of the frustum of a pyramid (cone) is equal to the sum…

The frustum of a triangular pyramid is equivalent to the sum of three pyramids whose common altitude…

Right triangle inscribed in semicircle. Illustration shows that the perpendicular from any point in…