triangles and angles

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Across
  1. 4. complete turn
  2. 6. to be two angles that are next to each other.
  3. 9. that are on the inside of the triangle.
  4. 10. equal to the sum of the opposite interior angles
  5. 11. that never meet
  6. 12. set of three integers
  7. 14. a angle that greater than 90 degrees.
  8. 15. angle that is less than 90 degrees.
Down
  1. 1. that is intersecting.
  2. 2. a triangle with two equal sides.
  3. 3. triangle with no equal sides.
  4. 5. angle that equals 180 degrees.
  5. 7. triangle with 3 equal sides.
  6. 8. angle of an isosceles triangle opposite one of the equal sides
  7. 13. angle that is exactly 90 degrees.