Tetrahedron
grabcad
I first started with the polygon tool and narrowed it to 3 sides 55mm each. I than made a plane on top of that triangle which was calculated amount (aprox 41.91mm)from the triangle base, after the plane was made i made a sketch on top and put a point right where the middle of the base triangle is. Lastly i used the lofted boss base feature to complete the tetrahedra.
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