Geometry Puzzle

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Across
  1. 2. Angles that sum to 90
  2. 10. A flat surface
  3. 11. The number of sides in an octagon
  4. 13. When a shape has equal angles
  5. 14. (x,y)->(-y,x) is an example of this
  6. 15. The point at which to sides of a shape meet
  7. 16. The line that cuts two parallel lines
  8. 18. Two or more shapes that have corresponding sides in the same proportion
  9. 20. A shape has this when it can be reflected on top of itself
  10. 21. Two shapes that are identical
  11. 23. A 6-sided figure
Down
  1. 1. A type of non-ridid transformation
  2. 3. Formed when lines intersect at right angles
  3. 4. ASA, SAS, or AAS for example
  4. 5. When two angles sum to 180
  5. 6. The distance from one side to the opposite vertex of a triangle
  6. 7. Inverse, contrapositive, and this
  7. 8. A shape that is equiangular and equilateral
  8. 9. A line with two endpoints
  9. 12. Coplanar lines that do not intersect
  10. 17. A triangle with three unequal sides
  11. 19. A line with one endpoint
  12. 22. The point (0,0) on the coordinate plane