In the Triangle

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Across
  1. 4. All its angles measure 60°
  2. 6. Three in a triangle
  3. 7. Perpendicular to one side and through the opposite vertex
  4. 8. A circle whose center is the intersection of two of the definition C
  5. 11. Pythagoras' favourite triangle!
  6. 12. A triangle with only one symmetry axis
Down
  1. 1. Intersection of two of definition A
  2. 2. Their sum is always 180°
  3. 3. The symmetry axis of a side
  4. 5. The symmetry axis of an angle
  5. 9. A circle whose center is the intersection of two of definition I
  6. 10. Connects the midpoint of a side and the opposite vertex