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On a gnomonic projection, straight lines represent

  • A.lines of equal latitude
  • B.lines of equal scale
  • C.arcs of great circles
  • D.lines of constant bearing

Answer: C

Projecting from the centre of the sphere onto a tangent plane makes every great circle appear straight, so the shortest route between two points can be drawn with a ruler. Navigators used it alongside Mercator, plotting the route on one and the bearings on the other.

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