The Spheres ClipArt gallery includes 74 images of spheres, including parts and zones of spheres and hemispheres. A sphere is a 3-dimensional figure in which all points are equidistant from a center point.

"An instrument for measuring the radii of spheres; a sphere-measurer. It is of especial service to opticians…

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

Diagram showing a spherical triangle constructed by the intersection of polar arcs.

Diagram showing a spherical triangle constructed by the intersection of polar arcs.