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7 lines
405 B
7 lines
405 B
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Exercise 2.48: A directed line segment in the
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plane can be represented as a pair of vectors—the vector running from the
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origin to the start-point of the segment, and the vector running from the
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origin to the end-point of the segment. Use your vector representation from
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Exercise 2.46 to define a representation for segments with a constructor
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make-segment and selectors start-segment and end-segment.
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