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Whichever segment it is to which you are referring, it does not need to be red; it can be any color.

The segment that intersects both foci is called the semi-major axis. The segment that is perpendicular to the semi-major axis with one end midway between the foci is called the semi-minor axis.

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Wiki User

9y ago
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Andres Perkins

Lvl 5
2y ago

Major Axis apex

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Q: What is the red line segment called in a ellipse?
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