Geometry symbols

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Across
  1. 1. (π)
  2. 3. Segment (—)
  3. 5. (→)
  4. 6. Angle (∟)
  5. 8. (∼)
  6. 9. (△)
  7. 10. Lines (∥)
  8. 13. (≅)
Down
  1. 1. (•)
  2. 2. Lines (⊥)
  3. 4. (⌒)
  4. 7. (○)
  5. 11. (↔)
  6. 12. (∠)