Foci of an ellipse

1 video
3 skills
Learn about the foci of an ellipse, which are two points for which the sum of the distances from any point on the ellipse is constant.

Foci of an ellipse from equation

VIDEO 13:49 minutes
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.

Foci of an ellipse from radii

PRACTICE PROBLEMS
Given the major and minor radii of an ellipse, find its foci.

Foci of an ellipse from equation

PRACTICE PROBLEMS
Given the equation of an ellipse, find its foci.

Equation of an ellipse from features

PRACTICE PROBLEMS
Given the foci of an ellipse (and some other feature), find its equation.