A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 282
ed by placing 5 of them about 0. Now, conceiving the convexityof the group O in front and the con-cavity of group O, we may placetl»e two together so as to inclose asolid. Thus, placing A at h, thethree faces 5, 6, 1, will enclose a tri-edrul, since the diedral included by5 and 1 is the diedral of… … Fig. 402. 264 EXERCISES IN GEOMETRICAL INVENTION.
Geometry · Trigonometry
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