Geometry Symbols

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Across
  1. 3. angle in 90°
  2. 5. Δ
  3. 7. '
  4. 9. |x-y|
  5. 10. grads angle unit
  6. 11. same shapes, not size
  7. 13. ⊥
  8. 15. infinite line
Down
  1. 1. parallel lines
  2. 2. equivalence
  3. 4. rad
  4. 6. grad
  5. 8. deg
  6. 12. ' in arcsecond
  7. 14. formed by two rays