Geometry symbols

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Across
  1. 3. arc from point A to point B
  2. 5. perpendicular lines (90° angle)
  3. 6. deg
  4. 8. infinite line
  5. 9. parallel lines
  6. 12. ′
  7. 13. same shapes, not same size
  8. 15. ABC = 30°
  9. 16. °
Down
  1. 1. ∟
  2. 2. ″
  3. 4. AOB = 30°
  4. 7. line from point A to point B
  5. 10. ∠
  6. 11. Δtriangle shape
  7. 14. line that start from point A