"A sphere is a solid bounded by a uniformly curved surface, every point of which is equally distant…
An illustration of a sphere cut into polygons as bases with their vertices at the center of sphere.
Illustration of two intersecting spheres. "The intersection of two spherical surfaces is the circumference…
An illustration showing how to construct a square circumscribed about a circle. "Draw the diameters…
An illustration showing how to construct a square inscribed in a circle. "Draw the diameter AB, and…
This vase is an antique design, Greek or Roman. It has two handles and a design of a figure in the center…