Make A Pyramid Out Of Cardboard

To make a pyramid our of cardboard, draw a square, then draw equally shaped triangles facing outward from each side. Cut it out, then fold the triangles upward to have them meet at the top.

Golden Ratio Pyramid Golden Ratio Pyramid

This is how you build a pyramid out of cardboard. In the first example (above, left), each triangular side is an equilateral triangle (with all three sides of each of the four triangles having the same length). If you were to fold the tabs upward to meet at the top, you would have an equilateral pyramid. In the second example (above, right) with the four triangles elongated, the slope changes. Slope is the angle at which the sides ascend toward the apex top of a pyramid.

Copper Pyramids (Giza, Nubian)