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Circle

the set of all points (x,y) that are equidistant from a fixed point, called the center of the circle.

radius

From center to a point on the circle.

ellipse, foci

an ________ the set of all points P such that the sum of the distances between P and two distinct fixed points, called the ______________, is a constant

vertices

The perpendicular bisectors of a triangle intersect at a point that is equidistant from "these" of the triangle

major axis, center

the line segment joining the vertices is the _____________________, and its midpoint is the ________ of the ellipse.

co-vertices

the line perpendicular to the major axis at the center intersects the ellipse at two points called the _______________.

Minor Axis

The shorter axis on an ellipse with co vertices