A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...
I am trying to figure out the angels for a pyramid triangle where the 4 pyramid sides are 18" wide on the bottom, 21" from the tip to the middle of the bottom (height) by .75" thick. The base is an 18 ...
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