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How to Calculate the Radius & Diameter of an Ellipse

An ellipse, in mathematical terms, is defined as the rounded section found on the inside of a cone. While an ellipse has no true radius, it does have a diameter, separated into both a major and minor axis. To find the diameter of both axes, use the foci points, located on either side of the major axis running left to right, to calculate the solution.

Instructions

- 1
  Add A and B together, where A + B is the distance from each focus point to any point on the ellipse and then square it. For example, if A and B together equal 4, 4 squared would be 16.
- 2
  Square the distance between the foci to solve for F.
- 3
  Subtract the number from the first step by the number from the second. Find the square root of this number to get the diameter of the minor axis.
- 4
  Add A and B together to find the diameter of the major axis.

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