In the Triangle

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Across
  1. 6. the symmetry axis of an angle
  2. 7. connects the midpoint of a side and the opposite vertex
  3. 9. circle whose center is the intersection of two of definition*
  4. 11. intersection of two of definition %
Down
  1. 1. Pythagoras' favourite!
  2. 2. all its angles measure 60°
  3. 3. circle whose center is the intersection of two of the definition #
  4. 4. the symmetry axis of a side
  5. 5. 3 in a triangle
  6. 6. perpendicular to one side and through the opposite side
  7. 8. their sum is always 180°
  8. 10. a triangle with only one symmetry axis