Crossword Puzzle Circle Vocabulary

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Across
  1. 3. Ring-shaped shape/structure
  2. 6. Around the circle
  3. 7. Ratio of circumference to diameter
  4. 8. Line that touches the circle at one point
  5. 9. Middle of the circle
  6. 11. Circles with a common center
  7. 12. Double the radius
Down
  1. 1. Half of the diameter
  2. 2. Half of a circle
  3. 4. Line passing through two points on a curve
  4. 5. Angle vertex at the center of the circle
  5. 10. Angle formed when two chords intersect
  6. 11. Line joining two points on circumference
  7. 13. Smooth curve joining two points