Physics Classroom
The Physics Classroom: Kepler's Second Law
Kepler's second law of planetary motion is stated and explained. An animation of the orbit of a planet and an accompanying graphic assists in explaining the meaning of the law of equal areas.
University of St. Andrews (UK)
University of St. Andrews: Orbits and Gravitation
A page describing the physics, mathematics, and historical figures associated with planetary motion, satellite motion, and universal gravitation.
ClassFlow
Class Flow: Algebra, Geometry Conic Review
[Free Registration/Login Required] Flipchart helps student to interpret algebraic equations and inequalities, geometry (cones, spheres, parabolas, etc.) and describes geometric relationships algebraically.
National Council of Teachers of Mathematics
The Math Forum: Foci of an Ellipse
The question, "If the major and minor axis of an ellipse are given, how do I find the focus points?" is answered at the Math Forum.
Wolfram Research
Wolfram Alpha: Conic Sections
The resource consists of a geometry animation that shows conic sections.
Other
Sandburg Center for Sky Awareness: What Are the Shapes of the Planets' Orbits?
In this lesson plan investigation students learn about the shapes of the planetary orbits by experimenting with ellipses of different proportions.
Math Words
Math words.com: Vertices, Ellipse
Basic definition for the vertex of an ellipse. Shown in a pictoral example as well.
Other
Ma Ttours Definitions of Ellipse Terms Foci
Basic definitions are given for foci, focus, and other terms related to the focus (foci).
Curated OER
Ellipse Conic
An overview of the four types of conic sections is presented. The origin of how each conic is formed and a table of various characteritics specific to each type of conic is shown.
Curated OER
Graph Ellipse (Horiz.)
An overview of the four types of conic sections is presented. The origin of how each conic is formed and a table of various characteritics specific to each type of conic is shown.
Curated OER
Graph Ellipse (Vert.)
An overview of the four types of conic sections is presented. The origin of how each conic is formed and a table of various characteritics specific to each type of conic is shown.
Curated OER
Ellipse Construction
This site from MathWorld is a good site explaining the ellipse that is in-depth and complete with pictures, charts, formulas and examples. A helpful, and informative site on the subject. Links are also provided for additional information.
Curated OER
Graphing Ellipses
This WebMath site shows how to graph ellipses. Click on the form of ellipse equation you need to plot the ellipse.
Curated OER
Graphing Ellipses
This WebMath site shows how to graph ellipses. Click on the form of ellipse equation you need to plot the ellipse.
Curated OER
Graphing Ellipses
This WebMath site shows how to graph ellipses. Click on the form of ellipse equation you need to plot the ellipse.
Curated OER
Graphing Ellipses
This WebMath site shows how to graph ellipses. Click on the form of ellipse equation you need to plot the ellipse.
Curated OER
Image of Ellipse Applet
Drawing a perfect ellipse with pins and string is demonstrated with a java simulation.
Curated OER
Drawing of Ellipse
Investigation and discussion of the way "Pin and string construction," works in producing an ellipse. Works through the corresponding equations in a well-ordered way.
Curated OER
Directrix
MathWorld delivers a brief definition of a focus, with diagrams showing the focus of an ellipse, a parabola, and a hyperbola.
Curated OER
Zona Land: Conic Sections the Ellipse
View a simple graph of an ellipse and a photo showing how the ellipse intersects a cone.
Curated OER
Zona Land: Conic Sections the Ellipse
View a simple graph of an ellipse and a photo showing how the ellipse intersects a cone.
Curated OER
University of St Andrews: Ellipse
The University of St. Andrews offers a comprehensive and detailed site explaining the ellipse.