Geometry symbol

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Across
  1. 3. 3.141592654
  2. 8. same shape but not same size
  3. 9. An angle can be measured using a protractor, precisely
  4. 10. C
  5. 12. infinite line
  6. 13. grads angle unit
  7. 15. formed two rays
Down
  1. 1. a notation used to denote the second derivative of a function
  2. 2. 90°
  3. 4. from A to B
  4. 5. the distances between pairs of points.
  5. 6. Δ
  6. 7. line that start from point A
  7. 11. °
  8. 14. '⌒'