Circles, Triangles, Angles

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Across
  1. 3. Distance from the centre
  2. 6. 90
  3. 7. 3 sides
  4. 8. 360
  5. 11. the outer length of the circle
Down
  1. 1. 180
  2. 2. the distance past the centre
  3. 4. circle half of a circle
  4. 5. 2 line segments intersect
  5. 6. more than 180
  6. 9. over 90
  7. 10. less than 90