Properties of Triangles: angles

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Across
  1. 4. two adjacent angles
  2. 6. 360° exactly
  3. 10. the sum of the three interior angles in a triangle adds up to 180°
  4. 13. angles that add up to 180°
  5. 14. corner of an angle
  6. 15. at least two congruent sides
  7. 17. two straight lines or rays meet at a common endpoint
  8. 18. 180° exactly
Down
  1. 1. angles that share a common vertex and side
  2. 2. angles opposite each other where two lines cross
  3. 3. the three angles on the inside of a triangle
  4. 5. less than 90°
  5. 7. exactly 90°
  6. 8. angles that add up to 90°
  7. 9. greater than 180°
  8. 11. created by extending one side of the triangle
  9. 12. two sides of the angle, joined at a common endpoint
  10. 16. more than 90°but less than 180°