#
Representation of segments using vectors.
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A directed line segment in the plane can be represented as a pair of vectors -- the vector running from the origin to the start-point of the segment, and the vector running from the origin to the end-point of the segment. Use your vector representation from exercise 2.46 to define a representation for segments with a constructor make-segment and selectors start-segment and end-segment.

```
(define vect1 (make-vect 1.0 2.5))
(define vect2 (make-vect 0.0 5.0))
(define segment (make-segment vect1 vect2))
(check-equal? (start-segment segment) vect1)
(check-equal? (end-segment segment) vect2)
```