crossword puzzle assignment

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Across
  1. 3. a polygon with three edges
  2. 6. that takes each point in a figure
  3. 9. a triangle in which two sides have the same length.
  4. 10. that have the same size and shape
  5. 11. ratio of new side to original side
  6. 12. having all sides equal
  7. 15. a transformation representing a flip of a figure
  8. 17. the point on a line segment
  9. 18. always the same distance apart.
  10. 19. a line that intersects two
Down
  1. 1. a line or ray that divides an angle into two congruent angles
  2. 2. functions of angles
  3. 4. serves to convince
  4. 5. to cut or divide into two equal parts
  5. 7. either of two angles lying on opposite
  6. 8. unit of measure for an angle
  7. 13. a proposition
  8. 14. known or independently determined
  9. 16. to find a solution