Statwords

Excel 243 home

Excel 244 home

244 Stats II

Calendar

Documents

Syllabus

Links

Aplia

254 Vector Calculus

Calendar

Documents

Homework

Syllabus

Links

CalcPlot3D

Math Help

CCC Math Lab

Mathwords

Khan Academy

WolframAlpha

Graphing tools

Multimedia

Lines

Polynomials

Trigonometry

Conics

Calculus

Quadrics

Mobius

Polyhedra

Misc

About me

Other links

Multimedia: Conic Sections



Ellipse: Sum of distances
from the foci is constant

(182K)


Conic Sections Defined by Eccentricity
Java Sketchpad version (Java enabled browser required)
Geometer's Sketchpad version (GSP 4 required)

Conic Sections Defined by Eccentricity
1. Move the slider for eccentricity and see what kind of conic section you get.
2. Move the focus to see what impact that has on the figure.
3. Move a point on the directrix to show that no matter what point is taken on the curve, the ratio of the distance to the focus over the distance to the directrix always equals the eccentricity.