Elective Crossword Puzzle

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Across
  1. 3. is a circle is the part of the circle enclosed by two radii
  2. 6. all 3 sides have the same length
  3. 8. is the distance of the circle
  4. 10. Part of a circle named by its endpoints
  5. 11. line segment whose endpoints are any two points on a circle
  6. 14. inscribed in a semicircle is a right angle
  7. 15. is the union of three or more coplanar segments
  8. 17. line segment that passes through the center of a circle
  9. 18. is a median of a triangle if its endpoints are a vertex and the midpoint of the opposite side
  10. 19. has four right angles
  11. 20. is greater than any of its parts
Down
  1. 1. has four congruent sides
  2. 2. has two pairs of parallel sides
  3. 4. has exactly one pair of parallel sides
  4. 5. has four right angles and four congruent sides
  5. 7. is the set of all points in a plane
  6. 9. no sides have same length
  7. 12. is the plural form of radius
  8. 13. two sides have same length
  9. 16. is a polygon formed by three segments joining three noncollinear points