Asked about: Conic Sections

why does an ellipse have two foci?

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Abby Garcia, Abby- Resident Noodle Expert

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Hello there! Here is some information on ellipse's and their foci:

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An ellipse has two focus points. The word foci (pronounced 'foe-sigh') is the plural of 'focus'. One focus, two foci.

The foci always lie on the major (longest) axis, spaced equally each side of the center. If the major axis and minor axis are the same length, the figure is a circle and both foci are at the center. Reshape the ellipse above and try to create this situation.

Note how the major axis is always the longest one, so if you make the ellipse narrow, it will be the vertical axis instead of the horizontal one.

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Two focus definition of ellipse

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Ellipse

Hope this helps!

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