Triangle

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Across
  1. 4. triangle that all sides are equal
  2. 7. ___angles which is outside of the triangle
  3. 11. triangle that has none of the sides are equal
Down
  1. 1. triangle has three ___
  2. 2. ___ of the triangle is 180 degrees
  3. 3. ___angle which larger than 180 degrees
  4. 5. triangle has three ___
  5. 6. ___ angle which is less than 90 degrees
  6. 8. triangle that two sides are equal
  7. 9. ___angle which equals to 90 degrees
  8. 10. ___angles which is inside the triangle