True length
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Indescriptive geometry,true lengthis any distance between points that is not foreshortened by the view type.[1]In a three-dimensionalEuclidean space,lines with true length areparallelto theprojection plane.For example, in a top view of apyramid,which is anorthographic projection,thebaseedges(which are parallel to the projection plane) have true length, whereas the remaining edges in this view are not true lengths. The same is true with an orthographicside viewof a pyramid. If any face of a pyramid was parallel to theprojection plane(for a particular view), all edges would demonstrate true length.
Examples of views in which all edges have true length arenets.
References
[edit]- ^Manual of Engineering Drawing 2009,ISBN0750689854,pp. 81–85
Further reading
[edit]- Boundy, A.W. (2012) "Engineering Drawing." McGraw–Hill.
- Simmons, C. H., Maguire, D. E., Phelps, N., & Knovel. (2009). "Manual of engineering drawing." Boston, Newnes.