Geometry

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Across
  1. 2. A position on a plane
  2. 3. A straight that goes on forever
  3. 4. Measure of rotation
  4. 5. A flat two dimensional surface
  5. 6. Part of a line that has one endpoint
  6. 7. Part of a straight line
Down
  1. 1. Points that lie on the same line
  2. 6. Used to measure a line