Tetrahedron

grabcad

I started with the Top Plane. The first tool I used was the polygon with the parameters of 3 faces. Smart dimension the polygon to 100mm then exit sketch You want to click features, reference geometry drop down arrow, plane the top plane and dimension it 81.23mm. Click on plane 1, reference geometry drop down arrow, point then the origin. Click features, lofted boss/base, sketch 1 and point. Last but not least hide plane 1 and point 1.Mass: 117.25 gramsVolume: 117245.41 cubic millimetersSurface Area: 17261.18 square millimeters