Circumference of a Circle of a Sphere Small 284×320 Medium 567×640 Large 908×1024 Download Tiff Original 2127×2400 | (354.6 KB) Description Diagram used to prove the theorem: "All points in the circumference of a circle of a sphere are equally distant from each of its poles." Keywords circle, circles, Circumference, sphere, spheres Galleries Geometric Theorems and Proofs Source: Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)