This square pyramid has a base edge with length 10 units. [br][br]The center of the base = (0,0,0). [br]The height of this pyramid = 5 units. [br][br][b]Try to construct this pyramid WITHOUT THE ELLIPTICAL WINDOWS first. [/b][br][br]If you're up for putting windows on the 4 lateral faces, here's a clue: [br][br]The projection of any elliptical window onto the pyramid's base = a circle with radius 1. The center of such a circle is 3 units away from the center of the base. [br][br]Reconstruct what you see here in this screencast in GeoGebra Augmented Reality or in [url=https://www.geogebra.org/3d]GeoGebra's 3D Graphing Calculator[/url]. [br][br][color=#ff00ff][b]Have fun with this! [/b][/color]