You can draw your own picture, let the side length be y and the side length of the bottom surface be x,

In the right triangle BB 1D 1, the height on the hypotenuse BD 1 is the distance h from the diagonal BD 1, and in the right triangle a1B 1, the hypotenuse a/kloc.

It is easy to find in right triangle BB 1D 1 and right triangle A 1B 1 respectively:

h=G(2)xy/G(2x^2+y^2)

d=xy/G(x^2+y^2)

Furthermore, H/D = G [(2x 2+2y 2)/(2x 2+y 2)] is easily found.

Y>x>0 is known.

You can find 2g (3)/3 < h/d < g (2).