A latus rectum for an ellipse is a line segment perpendicular to the major axis at a focus, with endpoints on the ellipse, as shown in the figure below. y b Latus rectum -b Foci Show that the length of a latus rectum is 2b²/a for the ellipse + = 1 with a > b. b2 The foci of the given ellipse are (+cv ,0), where c2 = a2 - b2. If the endpoints of one latus rectum are the points (c, tk), then the length of one latus rectum is Substitute one of the endpoints into the given equation for the ellipse and solve for k. = 1 1 1- a2 k2 = a2 k2 = Substitute b2 for a² - 2. a? k = Thus, the length of a latus rectum for the given ellipse is 2k =

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Rational Functions And Conics
Section4.3: Conics
Problem 98E
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A latus rectum for an ellipse is a line segment perpendicular to the major axis at a focus, with endpoints on the ellipse, as shown in the figure below.
y A
b
Latus rectum
-a
-b
Foci
Show that the length of a latus rectum is 2b2/a for the ellipse
x² y2
1
with a > b.
+
a?
b2
The foci of the given ellipse are (+ c v
0), where c2 = a2 – b2. If the endpoints of one latus rectum are the points (c, +k), then the length of one latus rectum is
Substitute one of the endpoints into the given equation for the ellipse and solve for k.
x2
y?
+
1
a2
b2
k2
+
1
b2
a?
k2
b2
1 -
k2
b2
a2
b2
k2 :
a2
k2 :
Substitute b2 for a? – c2.
%D
a?
k =
Thus, the length of a latus rectum for the given ellipse is 2k =
II
Transcribed Image Text:A latus rectum for an ellipse is a line segment perpendicular to the major axis at a focus, with endpoints on the ellipse, as shown in the figure below. y A b Latus rectum -a -b Foci Show that the length of a latus rectum is 2b2/a for the ellipse x² y2 1 with a > b. + a? b2 The foci of the given ellipse are (+ c v 0), where c2 = a2 – b2. If the endpoints of one latus rectum are the points (c, +k), then the length of one latus rectum is Substitute one of the endpoints into the given equation for the ellipse and solve for k. x2 y? + 1 a2 b2 k2 + 1 b2 a? k2 b2 1 - k2 b2 a2 b2 k2 : a2 k2 : Substitute b2 for a? – c2. %D a? k = Thus, the length of a latus rectum for the given ellipse is 2k = II
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