# What is meant by an ellipse in standard form?

The standard form of the ellipse, centered in the point $C \left({x}_{C} , {y}_{C}\right)$ and with the semi-axes $a$, horizontal and $b$, vertical is:
${\left(x - {x}_{C}\right)}^{2} / {a}^{2} + {\left(y - {y}_{C}\right)}^{2} / {b}^{2} = 1$.