Geometric Symbols

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Across
  1. 2. what is this symbol →AB
  2. 6. what is this symbol ⌒AB
  3. 7. what is this symbol ¯AB
  4. 9. what is this symbol °
  5. 11. what is this symbol "
  6. 12. what is this symbol Δ
  7. 13. what is this symbol π
Down
  1. 1. what is this symbol g
  2. 2. what is this symbol ∟
  3. 3. what is this symbol ⊥
  4. 4. what is this symbol ||
  5. 5. what is this symbol ′
  6. 6. what is this symbol ∠
  7. 8. what is this symbol ∼
  8. 10. what is this symbol c