In the Triangle

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