Triangle Sum Theorem

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Across
  1. 2. Name of the angle that sits directly outside a triangle.
  2. 4. Two lines that are directly across from each other
  3. 6. Number of degrees in a triangle: one hundred ______
  4. 7. a line that intersects two lines in the same plane
Down
  1. 1. Two angles that are congruent and directly across from each other
  2. 3. An angle that is greater than 90 degrees
  3. 5. A ninety degree angle
  4. 8. The two angles inside the triangle that are furthest from the exterior angle.
  5. 9. An angle that is smaller than 90 degrees