ELLIPSES IN STANDARD POSITION (0, c) (-c, 0) (c, 0) Ja b. -- (0.-c) 3-5- = 1 Figure 10.4.14 To illustrate how the equations in Figure 10.4.14 are obtained, we will derive the equa- tion for the ellipse with foci on the x-axis. Let P(x, y) be any point on that ellipse. Since the sum of the distances from P to the foci is 2a, it follows (Figure 10.4.15) that PF' + + PF = 2a
ELLIPSES IN STANDARD POSITION (0, c) (-c, 0) (c, 0) Ja b. -- (0.-c) 3-5- = 1 Figure 10.4.14 To illustrate how the equations in Figure 10.4.14 are obtained, we will derive the equa- tion for the ellipse with foci on the x-axis. Let P(x, y) be any point on that ellipse. Since the sum of the distances from P to the foci is 2a, it follows (Figure 10.4.15) that PF' + + PF = 2a
Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Derive the equation (x²/b²) + (y²/a²) = 1 given in Figure 10.4.14.
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