Chapter Four-Congruent Triangles

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Across
  1. 3. the angle formed by two adjacent sides of a polygon
  2. 6. are not adjacent to the exterior angle
  3. 7. 3 acute triangles
  4. 9. matching parts of the other polygon
  5. 10. turn;transformation around a fixed point called the center of rotation, through a specific angle, and in a specific direction
  6. 12. 3 congruent acute angles
  7. 14. uses statements written in boxes and arrows to show the logical progression of an argument
  8. 15. 1 right angle
  9. 17. extra line or segment drawn in a figure to help analyze geometric relationships
  10. 18. at least 2 congruent sides
  11. 19. use figures in the coordinate plane and algebra to prove geometric concepts
Down
  1. 1. all the parts of one polygon are congruent to the corresponding parts
  2. 2. 3 congruent sides
  3. 4. position of the image may differ from that of the preimage, but the two figures remain congruent
  4. 5. 1 obtuse angle
  5. 8. formed by one side of the triangle and the extension of an adjacent side
  6. 11. angles formed by the base and the congruent sides
  7. 13. side located between two consecutive angles of a polygon
  8. 16. flip; transformation over a line called the line of reflection
  9. 19. theorem with a proof that follows as a direct result of another theorem