Geometry/Angles

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Across
  1. 4. two angles that add up to 90 degrees (aka a right angle)
  2. 5. how angles are measured
  3. 7. when two lines are crossed by another line (aka transversal)
  4. 9. angle inside a shape
Down
  1. 1. a pair of angles on the opposite sides of a line
  2. 2. always adds up to 180 degrees
  3. 3. two angles that add up to 180 degrees
  4. 6. angles opposite each other when two lines cross
  5. 8. two angles that have a common side and a common vertex yet don't overlap