Math puzzle

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Across
  1. 4. a line dividing a geometric figure into 2 congruent halves
  2. 7. describes a set which is not finite
  3. 8. the point halfway between 2 given points
  4. 10. the part leftover after long division
  5. 13. the amount of quantity
  6. 15. a polygon with 6 sides
  7. 17. a line segment on the interior of the circle
  8. 18. the direction that the hands of a clock move
  9. 20. a ration of numbers or variables
Down
  1. 1. the distance around the outside of the plane
  2. 2. the shortest distance between the base of a geometric figure and it's top
  3. 3. the number that occurs the most often in the list
  4. 5. the point of intersection of the x and y axes
  5. 6. the geometric figure formed by 2 points
  6. 9. the y-coordinate in the point
  7. 11. another word for average
  8. 12. equally distant
  9. 14. 2 rays sharing a common midpoint
  10. 16. a statement accepted as true without proof
  11. 19. not equal to zero