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POSITIONS OF THE LINE in relation to the projection plane. Descriptive geometry, true magnitude, projecting line, projection plane, horizontal line, oblique line. It is important because we may need the true magnitude of a tunnel, pipe, road, cable, slope of a roof, etc. Follow us on: Blog: http://tutorialesdearquitectura.blogs... Twitter: @tutorialarq Facebook: www.facebook.com/tutorialesdearquitectura Google+: https://plus.google.com/+Tutorialesde... Instagram: @tutorialarq: / tutorialarq .