Elective Crossword Puzzle

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