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Alg2Hon 104 Notes and answers.notebook
1
April 30, 2013
Dec 89:45 AM
ellipse: set of all points in the plane the sum of whose distances from two fixed points, called foci, is constant.
http://www.brightstorm.com/math/algebra2/conicsections/theellipse
104 Ellipses
Dec 89:45 AM
• Center: the midpoint of the line segment joining the foci.• Semimajor axis: ½ of major axis• Semiminor axis: ½ of minor axis• Vertices: endpoints of the major axis • Covertices: endpoints of the minor axis
vertexvertex
covertex
covertex
Alg2Hon 104 Notes and answers.notebook
2
April 30, 2013
Sep 307:07 AM
(a2≥b2 always)
(a2≥b2 always)
Description
Center: (h,k)Foci: (h±c, k)Major axis: y=kMajor Axis Vertices: (h±a, k)Minor axis: x=hMinor Axis Vertices: (h, k±b)(or covertices)
Center: (h,k)Foci: (h, k±c)Major axis: x=hMajor Axis Vertices: (h,k±a)Minor axis: y=kMinor Axis Vertices: (h±b,k)(or covertices)
OrientationStandard form of the equation of an ellipse
Apr 299:35 PM
Eccentricity (e) describes the shape of an ellipse.e = c/a 0<e<1
Value of e Location of foci Graph
Close to 0 Near center of ellipse
Close to 1 Far from center of ellipse
Alg2Hon 104 Notes and answers.notebook
3
April 30, 2013
Apr 299:01 PM
Example 1 (p. 639) Got It? 1What is the equation in standard form of an ellipse centered at the origin with vertex (0, 5) and covertex (2, 0)?
Apr 299:05 PM
Example 2 (p. 640) Got It? 2aWhat are the foci of the ellipse with the equation 36x2 + 100y2 = 3600?Graph the foci and the ellipse.
Alg2Hon 104 Notes and answers.notebook
4
April 30, 2013
Apr 299:09 PM
Example 3 (p. 641) Got It? 3How far apart are the foci of an ellipse with a major axis of 26 ft and a minor axis of 10 ft?
Apr 299:16 PM
Example 4 (p. 641) Got It? 4What is the standard form equation of an ellipse with foci at (0, ±√17) and covertices at ( ±6, 0)?
Alg2Hon 104 Notes and answers.notebook
5
April 30, 2013
Sep 307:07 AM
Example 5Find all parts of the ellipse and graph.
center:
length of major axis:
length of minor axis:
vertices:
covertices:
foci:
Sep 307:07 AM
Example 6Write the equation of the ellipse in standard form and then graph the ellipse.
x2+5y2+4x70y+209=0
Alg2Hon 104 Notes and answers.notebook
6
April 30, 2013
Apr 299:21 PM
Example 7 (p. 643) 45.
Apr 299:29 PM
Practice(p. 642) 12, 16, 24, 32, 38, 44(p. 658) 8, 16, 22
Alg2Hon 104 Notes and answers.notebook
7
April 30, 2013
Apr 3011:23 AM