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Ellipse equation review (article) | Khan Academy
Review your knowledge of ellipse equations and their features: center, radii, and foci.
Foci of an ellipse from equation - Khan Academy
Sal explains how the radii and the foci of an ellipse relate to each other, and how we can use this relationship in order to find the foci from the equation of an ellipse.
Khan Academy
Learn about the basic features and properties of hyperbolas in this introductory lesson on conic sections.
Conic sections | Precalculus | Math | Khan Academy
When we slice a cone, the cross-sections can look like a circle, ellipse, parabola, or a hyperbola. These are called conic sections, and they can be used to model the behavior of chemical reactions, electrical circuits, and planetary motion.
Foci of an ellipse from equation - Khan Academy
Given the equation of an ellipse, find its foci. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
Equation of an ellipse from features (practice) | Khan Academy
Given the foci of an ellipse (and some other feature), find its equation. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our …
Conic sections | Precalculus (2018 edition) | Math - Khan Academy
Learn about the four conic sections and their equations: Circle, Ellipse, Parabola, and Hyperbola.
Conic section from expanded equation: circle & parabola - Khan …
If the x^2 and y^2 terms have the same coefficient, then it is a circle. If the terms have different coefficients, then it is an ellipse. Ex: x^2 + y^2 = 9 is a circle where as x^2 + 3y^2 = 9 is an ellipse.
Getting ready for conic sections - Khan Academy
Practicing finding measurements in a circle, using the Pythagorean theorem, and completing the square will help us get ready for reasoning about conic sections (such as circles and parabolas).