Geometry symbols

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Across
  1. 4. the infinite line
  2. 5. the formed by two Ray's
  3. 7. the symbol of radians
  4. 8. the symbol name of =90°
  5. 10. the arcminute, 1°=60'
  6. 12. the symbol is ~
  7. 14. the symbol is ||
  8. 15. the arc from point A to point B
Down
  1. 1. the triangle shape
  2. 2. the perpendicular lines (90° angle)
  3. 3. the symbol is °
  4. 6. the symbol of gradiands/gons
  5. 9. the symbol is |x-y|
  6. 11. the radians angle unit
  7. 13. the line that start from point A