Foci (correct plural of focus)
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An ellipse have two focal points.
foci and axes.
An ellipse is a shape on which the sum of the distances from every point to two points inside called the foci (focuses) is always the same number. A circle is an ellipse with both foci (focuses) at the same point.
No
The two central points of an ellipse are officially known as the foci (plural of focus).