It’s not a square based pyramid, it’s a triangular based pyramid. Imagine the top right hand one floating up onto the air and moving to hover above the centre of the other three (which move to make an equalateral triangle). The distances work but the layout changes.
No
Unless the measurement is from the corner to where the lines cross (peak of the pyramid), but that is not at all clear from how the diagram is drawn.
It’s not a square based pyramid, it’s a triangular based pyramid. Imagine the top right hand one floating up onto the air and moving to hover above the centre of the other three (which move to make an equalateral triangle). The distances work but the layout changes.
You mean a tetrahedron.
I do.