Mathematics Crossword Puzzle

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Across
  1. 5. has only one dimension
  2. 7. The average level math class for freshman
  3. 9. next to or adjoining something else
  4. 10. the number of different digits that a system of counting uses to represent numbers
  5. 11. when you can move, rotate, flip, and will stay the same
  6. 14. has one pair of opposite sides that are parallel.
  7. 17. a polygon by which a solid object is bound
  8. 18. When three or more lines meet at a single point
  9. 20. the "if" and "then" parts of a sentence are switched
Down
  1. 1. a regular quadrilateral
  2. 2. a segment that passes through the center and has its endpoints on the circle
  3. 3. any fixed or conventional method for doing something
  4. 4. a segment connecting any vertex of a triangle to the midpoint of the opposite side.
  5. 6. the distance around
  6. 8. a line segment where two faces intersect
  7. 12. a segment connecting two consecutive midpoints of a triangle
  8. 13. the point where two sides of a polygon meet.
  9. 15. a quadrilateral that has two pairs of adjacent sides the same length
  10. 16. can be used to describe a translation
  11. 19. a two-dimensional representation of a three-dimensional object