Illustration showing that “the solids formed by the dissected part of the sphere are pyramids.”
Samuel Hamilton, PH.D. School Arithmetic (Philadelphia: 20th Century Publishing Co., 1907) 299
2400×1169, 567.0 KiB
1024×498, 65.2 KiB
640×311, 33.4 KiB
320×155, 12.3 KiB