Geometry Symbol

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Across
  1. 3. π (symbol name)
  2. 4. ∟ (symbol name)
  3. 7. ⊥ (symbol name)
Down
  1. 1. ≅ (symbol name)
  2. 2. |x-y|(symbol name)
  3. 5. ∠ (symbol name)
  4. 6. ~ (symbol name)
  5. 7. || (symbol name)