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 314
■: OR : : OR : OB, or OA : OC :: OC : OB. Now, for any^omX in this cir-cumference, as R, we shall have OA : OR : : OR : OB, since OR = OC, and OA,OC, and OB are constant. Hence, wherever R is taken (in this circumference),the triangle ORB is similar to ORA, angle ORB = PAB, and BRC = CPA.Finally,… … SKG. Prob.—In a fixed circle^ any two chords intersect at right-^ angles in a fixed point; find the locus of the centre of the chord join-^ying their extremities. Give the proof. 877. Prob.—Fi7id the locus of the point in space equidistantfrom three given p>oints. Give the proof. 878. Prob.—Find…
Geometry · Trigonometry
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