Geometry symbol

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Across
  1. 3. distance between x and y
  2. 4. triangle shape
  3. 7. infinite line
  4. 8. parallel lines
  5. 10. arc from Point A to point B
  6. 11. angle 90°
  7. 12. to equivalence of geometric shapes and size
Down
  1. 1. radians angle units
  2. 2. grads angle unit
  3. 3. 1 turn=360°
  4. 5. prime arcsecond, 1¹=60
  5. 6. same shape
  6. 8. constant the ratio between circumference and diameter
  7. 9. line start from point A
  8. 10. formed by two ray