angle relationships in circles and angles of polygons

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Across
  1. 3. the number of sides on a pentagon
  2. 6. a twelve sided polygon
  3. 7. an angle that's outside of a polygon
  4. 10. a line that connects two endpoints inside of a circle
  5. 11. an angle that's inside of a polygon
  6. 12. a line that passes through one point of a circle
  7. 13. two or more angles that add up to 180 degrees
  8. 15. a line/angle that's outside of a circle
Down
  1. 1. a seven sided polygon
  2. 2. a regular shape with three or more sides
  3. 4. a portion of a circle that's surrounded by two lines that meet at a vertex or the center of a circle
  4. 5. two angles that are vertical to each other
  5. 8. a line that passes through two points in a circle
  6. 9. an angle that's at the center of a circle and it's endpoints are on the edge of the circle
  7. 14. the degree measure of each interior angle in an equilateral triangle