# Ellipses

## Collection of points whose sum of distances from two foci is constant.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Identifying Components of Ellipses - Overview

by CK-12 //basic
Overview
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• Video

## Identifying Components of Ellipses - Example 1

by CK-12 //basic
Identifying Horizontal v. Vertical Major Axes Given the Equation for an Ellipse
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• Video

## Identifying Components of Ellipses - Example 2

by CK-12 //basic
Identifying the Vertices, Co-Vertices, and Foci Given the Equation for an Ellipse
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• Real World Application

## Eccentric Astronomers

by CK-12 //basic
Learn about the astronomers who discovered that the planets’ orbits are ellipses.
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