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Originally Posted by Squirrelrock
to make a tetra-shaped pyramid, one could possibly draw four triangles - one equilateral on the bottom for the bottom, and three on the sides of the bottom at 90 degrees to it that are the vertical length and width of the sides. Extrude the bottom, say, 50 inches, and then extrude the sketches with the intersect option and through all selected (or specify a distance, I don't have inventor in fromt of me right now and can't remember.) I think that this will work.
Squirrel
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This soulds easy, but might make more problems. Unless you know the exact shape of the other triangles in projection, you will get a bad shape. The side triangles are equalitateral but not if you look at the from the side. The would be squashed triangles.