Crossword of Geometry Math Symbols

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Across
  1. 1. Ratio between the circumference and diameter of a circle
  2. 5. "
  3. 8. =90°
  4. 9. Grads angle unit
  5. 11. ⊥
  6. 12. ∠
  7. 13. Line that start from point A
Down
  1. 2. Equivalence of geometry shape and size
  2. 3. Radiants angle unit
  3. 4. Same shape but not same size
  4. 6. ∥
  5. 7. °
  6. 10. '