Geometry Symbols

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Across
  1. 1. ′
  2. 4. ∠
  3. 6. a smooth curve joining two endpoints
  4. 9. π
  5. 10. grad g
  6. 12. ∟
  7. 13. ° deg
  8. 15. ⊥
Down
  1. 2. rad c
  2. 3. Δ
  3. 5. a one-dimensional figure, which has length but no width
  4. 7. |x-y|
  5. 8. ∥
  6. 11. ~
  7. 14. a line with a single endpoint (or point of origin) that extends infinitely in one direction