Question

The formula for sphere that have two radius

Answer 1

do you mean an ellipsoid?

Answer 2

$$
{x^2 \over a^2}+{y^2 \over b^2}+{z^2 \over c^2}=1,
$$

The oblate and prolate are the only ellipsoids with two radii:

There are four distinct cases of which one is degenerate:

a>b>c — tri-axial or (rarely) scalene ellipsoid;
a=b>c — oblate ellipsoid of revolution (oblate spheroid);
a=b<c — prolate ellipsoid of revolution (prolate spheroid);
a=b=c — the degenerate case of a sphere;