Why the radius is 1.9 and not scale the height in z axis 3.8 instead?

[ambika]

I understand why he takes 3.8 BU but doesn’t understand why he takes the radius of a cube? Instead, he can take the height of the cube to 3.8 BU.

[NixeKnox]

He uses radius because it asks for radius in the operator panel when the cube spawns.