geometry crossword puzzle

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Across
  1. 2. a line that divides a triangle into two pairs of equal sides
  2. 5. a line that connects two points on a circle
  3. 6. a shape with three or more sides
  4. 9. a shape with four equal sides and four right angles
  5. 10. a shape with three slides
  6. 13. a shape with four sides and four right angles
  7. 15. the distance around a circle
  8. 17. a shape with no sides or vertices
  9. 19. a shape with six sides
  10. 20. a line that is parallel to another line
  11. 21. a line that touches a circle at exactly one point
  12. 22. to a line that is perpendicular to another line
Down
  1. 1. a line that passes through the center of a circle
  2. 3. a shape with two equal sides and two equal angles
  3. 4. a line that is perpendicular to a tangent line at the point of tangency
  4. 7. a shape with four sides and two pairs of parallel sides
  5. 8. a line that never intersects another line
  6. 11. a lone that divides a circle into equal halves
  7. 12. a line that is parallel to the base of a triangle
  8. 13. a shape with four sides and two pairs of equal sides
  9. 14. a line that intersects a circle at two points
  10. 16. a three dimensional shape with six square faces
  11. 18. a shape with five sides