Define Diameter of Sphere:
A non-Euclidean geometry in which is the study of figures on the surface of a sphere
the length of a segment passing through the center of the sphere, with endpoints on the sphere. The diameter of a sphere is
equal to the diameter of great circle in the sphere.
the study of plane and solid figures on the basis of axioms and theorems
a circle on a sphere that divides the sphere into two equal hemispheres