Examples

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Across
  1. 1. gradians / gons
  2. 6. perpendicular lines (90° angle)
  3. 9. triangle shape
  4. 12. segment line from point A to point B
  5. 13. same shapes, not same size
  6. 14. 1 turn = 360°
Down
  1. 2. prime arcsecond, 1′ = 60″
  2. 3. arc from point A to point B
  3. 4. parallel lines
  4. 5. formed by two rays
  5. 7. infinite line
  6. 8. to equivalence of geometric shapes and size
  7. 10. radians
  8. 11. distance
  9. 15. line that start from point A