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An opisometer is used on a map to measure

  • A.the angle between two bearings
  • B.the area enclosed by a boundary
  • C.the height difference along a path
  • D.the length of a winding route

Answer: D

A small wheel run along the line accumulates its true length, which a straight rule cannot give for a curving road or river. A piece of thread laid along the route and then straightened does the same job less precisely.

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