Geometry Symbols

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Across
  1. 1. - ◯
  2. 3. - ⊃
  3. 5. - □
  4. 7. lines - ⊥
  5. 8. - ∠
  6. 12. - ≡
  7. 14. segment - AB (with endpoints A and B)
  8. 15. an element of - ∉
  9. 16. - AB with a line above it
Down
  1. 2. - ≅
  2. 4. lines - ∥
  3. 6. - ⊂
  4. 9. of - ∈
  5. 10. - Δ
  6. 11. (of sets) - ∪
  7. 13. equal - ≠