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 293
Fig. 4-23. … Fig. 424. 2d Method. pO, pObeing parallel to each other,ppT gives the intersectionof the tangent with the linepassing through the centres,sinceOT : OT, or pO —pO : pO : : 00 : OT.Also, PO - PO : PO : : 00^ OT.Hence OT is constant for all positions of the parallel radii. Prove that ifthe parallel…
Geometry · Trigonometry
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