Advanced algebra e portfolio ellipses
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Advanced Algebra E-portfolio Ellipses. Background. Vocabulary. Sample Problems. Calculator Hints. Sources. Feedback. Advanced algebra- 1st. Exit. Background.

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Advanced algebra e portfolio ellipses

Advanced Algebra E-portfolioEllipses

Background

Vocabulary

Sample Problems

Calculator Hints

Sources

Feedback

Advanced algebra- 1st

Exit


Background
Background

  • Early astronomers believed that planets traveled in circular orbits, but mathematician Johannes Kepler proved that planetary orbits re actually flattened circles or ellipses.


Background1
Background

Standard Form for the equation of an ellipse with a vertical major axis:

Standard form for the equation of an ellipse with a horizontal majoraxis:


Vocabulary

P

F1

F2

Vocabulary

  • Ellipse- The set of all points (x,y) such that the sum of the distances between (x,y) and two distinct fixed points (foci) are constant.

  • Focus- The fixed points of the ellipse.


Vocabulary1

CV

F1

F2

V

V

CV

Vocabulary

  • Vertices- The points on a line that pass through the foci on the major axis.

  • Covertices- The endpoints of the minor axis.


Vocabulary2

CV

F1

F2

V

V

CV

Vocabulary

  • Major Axis- The axis that joins two points on an ellipse farthest from its center.

  • Minor Axis- The axis that joins the points on the ellipse nearest its center.


Sample problems
Sample Problems

  • The center of the ellipse is at (0,0), and its major axis is on the y-axis. The vertices on the major axis are 4 units from the center (a=4). The vertices on the minor axis 2 units from the center (b=2). Write an equation in standard form for the ellipse.

  • Step #1- Plug a and b into the equation

  • X2+ y2 = 1

  • 42

  • Step #2 - Simplify the equation

  • X2 + y2 = 1

  • 4 16


Sample problems1
Sample Problems

  • Put the equation in standard form.

  • 49x2 + 16y2 = 784

  • Divide both sides of the equation by 784.

  • Simplify:


Sample problems2
Sample Problems

  • Put the equation in standard form and find the center and vertices.

    9(x2+6x+9-9) + 4(y2-2y+1-1) +49=0

    9(x+3)2-81+ 4(y2-1)2-4+49=0

    9(x+3)2 + 4(y-1)2=36

    9(x+3)2 + 4(y-1)2 =1

    36 36

    (x+3)2 + (y-1)2 =1

    4 9

    Center (-3,1)

    Vertices (-1,1)(-5,1)

    (3,4)(-3,-2)


Calculator hints
Calculator Hints

A calculator will help to simplify the equations involved in an ellipse but not graphing. There are websites that will help with graphing ellipses. All you have to do is put in the vertices and the covertices; the equation will be graphed automatically.

http://ca.geocities.com/xpf51/MATHREF/ELLIPSE.html

http://www.projects.ex.ac.uk/trol/scol/callipse.htm

http://www.1728.com/ellipse.htm


Sources
Sources

◦http://faculty.ed.umuc.edu/~swalsh/WeMathhelp/Ellipses/Solutions/Solution9.html

◦http://home.alltel.net/okrebs/pages62.html

◦http://www.pruplemath.com/modules/sqrellps.htm


Feedback
Feedback

  • Visually appealing, but lacking formatting consistency. Correct spelling/grammar errors.

  • Clarify definitions and content to make is easier to understand. Concise presentation.


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