Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 139
ound in this way and the parabola passed through them. 72. Auxiliary circles. — The auxiliary circle of a cen-tral conic is a circle described on the major axis asdiameter. Its equation is x^ -{- y^ = a?. The circle described on the minor axis as diameteris called the minor auxiliary circle. Its… … Fig. 68. Fig. 68, Pj and R are corresponding points. The angleM^ CR is called the eccentric angle of the point P^ There is a simple relation between the ordinates of thecorresponding points P^ and R which may be found inthe following manner. Let tlie coordinates of P^ be(ajj, ?/i), and of R (rr^,…
Geometry, Analytic
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