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Parallels
Published online by Cambridge University Press: 22 September 2016
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Given a straight line L in the plane, how can we find all lines parallel to L? Here is one way: at each point P of L draw a straight line perpendicular to L. Now choose a number d and measure a distance d down these lines, always in the same direction. Joining up the points P′ so obtained gives the parallel to L at distance d.
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- Copyright © Mathematical Association 1982