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Notes - Conic Sections Ellipse Ellipse: the locus of points in a plane such that the sum of the distances from the foci is a constant Stretched Horizontally a2 > b2 or Graph by plotting center and the vertices of the major and minor axes. Use string and tape to create an ellipse. See Calculus in Motion Stretched Vertically OR Homework Examples: Given the equation, find the center and vertices then sketch the graph.