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The major axis of a conic section is the longest diameter that passes through its center and both foci. It is commonly associated with ellipses and hyperbolas.
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Semi-Major Axis: Half of the major axis; it extends from the center to one end (vertex) of an ellipse.
Minor Axis: The shortest diameter that passes through the center and is perpendicular to the major axis in an ellipse.
Focus (Foci): Points used to define and construct conic sections; for ellipses and hyperbolas, these points lie along the major or transverse axes.