Circle Geometry Puzzle

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Across
  1. 1. A line that cuts through a circle, intersecting it at exactly two distinct points
  2. 7. The total distance around its outside boundary
  3. 9. A fraction or portion of the outer edge/circumference of a circle
  4. 10. The distance around the outside of the circle
  5. 12. A type of angle formed by two chords in a circle that have a common endpoint on the circle's edge
  6. 13. A line segment whose endpoints both lie on the edge of the circle, but it doesn't have to pass through the center
Down
  1. 2. The fixed point directly in the middle of a circle
  2. 3. The amount of space trapped inside a circle
  3. 4. An angle whose vertex sits exactly at the center of the circle
  4. 5. A straight line segment that passes through the center of the circle
  5. 6. The angle formed between two radii at the center of a circle
  6. 7. Mathematical constant approximately equal to 3.14
  7. 8. A line that touches the outside of a circle at exactly one single point without crossing through it
  8. 10. A flat, two-dimensional shape where all points on the edge are the exact same distance from the center
  9. 11. The distance from the center of a circle to any point on its outer edge