nothing,. its all just passage ways.
A pyramid shape looks lyke a pyramid
a triangular pyramid looks like a pyramid with 4 sides and 1 face
A tetrahedron.
An energy pyramid gets its name from its graphical shape which looks like a pyramid.
a pyramid
it looks exactly like a square pyramid
a rectangular pyramid
Pyramid
It looks like a 3-D triangle.
It could be a pyramid
A four-sided die.
The difference is 90 degrees.The side view looks like a triangle.The top view looks like a rectangle with its diagonals.