The semimajor axis (also called the major semi-axis, major semiaxis, or major radius) of an ellipse (or related figure) is half its extent along the longer of the two principal axis.
See alsoEllipse,
Radius,
Semiminor Axis Explore with Wolfram|AlphaMore things to try:
Cite this as:Weisstein, Eric W. "Semimajor Axis." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SemimajorAxis.html
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