Foundational Words of Geometry

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Across
  1. 4. refers usually to an element of some
  2. 5. like a mirror.
  3. 8. a pair of lines that are non-
  4. 10. 180°
  5. 12. called a space
  6. 13. the equation of a straight line
Down
  1. 1. this makes a 90° angle
  2. 2. a piece or part of a line having two
  3. 3. 2 lines that do not intersect
  4. 4. a straight line in geometry used
  5. 6. two lines that are perpendicular to
  6. 7. line using its slope 'm' and a
  7. 9. 2 dimensional object
  8. 11. a straight _.
  9. 14. represent the equation of a