Manual of Geometry And Conic Sections, With Applications to Trigonometry And Mensuration
Manual of Geometry And Conic Sections, With Applications to Trigonometry And Mensuration
William G William Guy Peck
The book Manual of Geometry And Conic Sections, With Applications to Trigonometry And Mensuration was written by author William G William Guy Peck Here you can read free online of Manual of Geometry And Conic Sections, With Applications to Trigonometry And Mensuration book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Manual of Geometry And Conic Sections, With Applications to Trigonometry And Mensuration a good or bad book?
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Proposition XII. Theorem. An ellipse is symmetrical with respect to both of its axes. Let P be any point of the ellipse whose foci are F and F', whose transverse axis is AO, and whose conjugate axis is D£. Let the part APO be revolved about AO through a half revolution ; P, will fall on the perpendicular PP', making HP' equal to HP, FP will fall on FP',and FT on FT; consequently, FF + FT' is equal to FP + FT, or to AO ; hence, P' is a point of the curve, (P. 11, Cor.), that is, for every point ...P there is a second point P', such that the line joining them is perpen- CONIC SECnOKB. dicalar to^ and is bisected by, the transyerse axis. Again, let the part DPB be revolved about DE through a half revolution ; P will &11 on the perpendicular PQ, making KQ equal to KP, P will faU on F, the line FP will fall on P'Q, and the angle OPP on the angle OP'Q ; hence, the triangles FFT and FF'Q are equal in all their parts, and consequently, Q is a point of the curve, that is, for every point P, there is a second point Q, such that the line joining them is perpendicular to, and is bisected by, the con- jugate axis.
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