Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 125
-verse axis AA. Attach one end of it at F, the other at F.Place the point of a pencil in the loop formed by the cordand stretch it upward until taut. Wheeling the pencil around,while keeping the point on the paper and tightly pressed 110 PLANE ANALYTIC GEOMETRY. against the cord, the path described… … Fig. 36. evident during the operation that the sum of the distances ofthe point of the pencil from the foci is constant and equal tothe length of the cord; i.e., to the transverse axis. Second Method. — Take any point C on the transverse axisand measure the distances AC, AC. With F as a centre…
Geometry, Analytic
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