solid geogebra
facet normal 0.56 0.12 0.81
    outer loop
        vertex 0.00 0.00 11.13
        vertex 11.85 -12.87 4.94
        vertex 5.22 16.70 4.94
    endloop
endfacet
facet normal -0.17 -0.55 0.81
    outer loop
        vertex 0.00 0.00 11.13
        vertex -17.07 -3.82 4.94
        vertex 11.85 -12.87 4.94
    endloop
endfacet
facet normal -0.39 0.42 0.81
    outer loop
        vertex -17.07 -3.82 4.94
        vertex 0.00 0.00 11.13
        vertex 5.22 16.70 4.94
    endloop
endfacet
facet normal -0.33 0.36 -0.87
    outer loop
        vertex -17.07 -3.82 4.94
        vertex 5.22 16.70 4.94
        vertex 0.00 -0.00 0.00
    endloop
endfacet
facet normal 0.48 0.10 -0.87
    outer loop
        vertex 5.22 16.70 4.94
        vertex 11.85 -12.87 4.94
        vertex 0.00 0.00 0.00
    endloop
endfacet
facet normal -0.14 -0.46 -0.87
    outer loop
        vertex -17.07 -3.82 4.94
        vertex 0.00 0.00 0.00
        vertex 11.85 -12.87 4.94
    endloop
endfacet
endsolid geogebra