B. Geometry Symbols

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Across
  1. 4. ≅
  2. 7. angle measure 90°
  3. 8. the most common unit for measuring angle
  4. 10. ～
  5. 12. arcminute
  6. 14. lines that doesn't intersect
  7. 15. |x-y|
Down
  1. 1. denoted by symbol rad
  2. 2. formed by two rays
  3. 3. ⌢
  4. 5. line from point A to point B
  5. 6. arcsecond
  6. 9. line that start from point A
  7. 11. △
  8. 13. grads angle unit