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