Question

What is Ellipsoid?

Answer

Ellipsoid is a quadric whose equation in a suitable coordinate system is
$\frac{x^2}{a^2}+\frac{y^2}{b^2}+\frac{z^2}{c^2}=1$
Centred at c(h, k, l) and semi-axis a, b, c.
$\frac{{\left(x–h\right)}^2}{a^2}+\frac{{\left(y–k\right)}^2}{b^2}+\frac{{\left(z–1\right)}^2}{c^2}=1$

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