Math Crossword Puzzle

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Across
  1. 2. A measure of the amount of space enclosed by three-dimensional figure
  2. 5. If a statement is representated by p, then p is the negation of the statement
  3. 8. A comparison of two quantities using division
  4. 10. Points that lie on the same line
  5. 11. The point of concurrency of the perpendicular bisectors of a triangle
  6. 14. The point of concurrency of the altitudes of a triangle
  7. 17. In a pyramid or cone, the segment that has the vertex as one endpoint and is perpendicular to the base
  8. 20. Any sentence that either true or false, but not both
Down
  1. 1. The point of concurrency of the medians of a triangle
  2. 3. In a triangle, a line segment with endpoints that are a vertex of a triangle and the midpoint of the sides opposite the vertex
  3. 4. An equation of the form that states two ratios are equal
  4. 6. The distance between two lines measured along a perpendicular line is always the same
  5. 7. A quadrilateral with parallel opposite sides
  6. 9. The point of concurrency of the angle bisectors of a triangle
  7. 12. Having the same measure
  8. 13. A statement that can be easily proved using a theorem is called a corollary of that theorem
  9. 15. An educated guess based on known information
  10. 16. In a polygon, a segment that connects nonconsecutive vertices of the polygon
  11. 18. A quadrilateral with four right angles
  12. 19. The intersection of two noncollinear rays at a common endpoint