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  "body": "\n## Summary\n\nDescriptive geometry represents three-dimensional objects by two-dimensional drawings, usually several orthogonal projections, and solves spatial problems by constructions on these drawings.\nIts classical form is due to Gaspard Monge.\nThere a point of space is given by its projections onto a horizontal and a vertical plane, drawn together on one sheet.\nFrom such drawings one can construct true lengths, true angles, intersections of surfaces and shadows.\nIt was the theoretical basis of technical drawing in engineering and architecture.\n\n## Explanations\n\n### L1 human\n\nAn engineer's drawing of a machine part usually shows a top view and a front view, side by side, carefully lined up.\nEach view alone loses one dimension, but together they fix the object completely.\nDescriptive geometry is the set of rules for making such views and for reading answers from them.\nExamples are the true length of a slanted rod or the line where two pipes meet.\nIt does by careful drawing what analytic geometry does with coordinates.\n",
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