Geometry: Circle Stuff

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Across
  1. 2. Half of the diameter
  2. 4. This line from
  3. 6. It's 360 degrees around
  4. 7. ratio of circumference to diameter
  5. 8. twice the radius
  6. 9. These angles
  7. 11. This is a measure of
  8. 12. This means they're
Down
  1. 1. This is part of a circle
  2. 3. This is
  3. 4. These angles are
  4. 5. Alternate ______________ angles are congruent
  5. 10. This type of angle...
  6. 11. The measure of