a) which divides the sphereinto two equal parts, or hemis2iheres, is called a great circl^of the sphere, Obs. 4.—A circle (g h i k g) which divides the sphereinto two unequal parts, is called a less circle of the sphere. Obs. 5.—A segment of a sphere is a part (d) cut off by aplane, the section of… … Obs. 7-—a sone of a sphere is that part which is inter-cepted between two parallel planes (a B D e A, f G H i f) ;and when these planes are equally distant from the centr-(c), it is called the middle zone of the sphere.
Design · Decoration and ornament · Art
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