Enable text based alternatives for graph display and drawing entry

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1234567891011-1123-1-2-3[Graphs generated by this script: initPicture(-1,11,-3,3);axes(1,1,1,1,1);stroke='blue';strokewidth=2;line([5,1],[9,1]);line([5,-1],[9,-1]);line([9,1],[9,-1]);line([0,0],[5,1]);line([0,0],[5,-1]);]

The graph above shows the base of an object. Compute the exact value of the volume of the object, given that cross sections (perpendicular to the base) are equiangular triangles.

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