Formula

Standard Form of the Equation of an Ellipse with Center (h,k)(h, k)

The standard form of the equation of an ellipse with its center at (h,k)(h, k) is (xh)2a2+(yk)2b2=1\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1. In this formula, the orientation of the major axis is determined by comparing the denominators. When a>ba > b, the major axis is horizontal, meaning the distance from the center to each vertex is aa. Alternatively, when b>ab > a, the major axis is vertical, and the distance from the center to each vertex is bb.

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Updated 2026-05-25

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