How far can you see the horizon through an airplane window at height of 8,000 m

Question

Approximately, the distance d in miles that a person can see to the horizon is represented
by the equation 𝒅 = √
𝟑𝒉
𝟐
, where h is the height where the person is. (1 mile = 1, 609.3 m)

Answer 1

If d = √3h²

then d = h√3

Is the correct formula?