AP produced, and the parallelogram /WKWbe completed, the diagonal PO of this parallelogram will be the direction of the motion of the generating point at P, and consequently the tangent to the curve at this point. It is clearly seen from this, that in... An Elementary Treatise on Descriptive Geometry... - Página 84 por John Fry Heather - 1851 - 137 páginas Vista completa -
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