Geometry Chapters 1-4 Vocabulary Puzzle

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Across
  1. 4. in a conditional statement the word that immediately follows the word "if"
  2. 5. 3 or more lines intersect at the same point
  3. 6. a part of a line that has a beginning but no end
  4. 9. acute triangle in which all angles are congruent
  5. 12. three sided polygon
  6. 13. two lines that are intersecting make two sets of congruent angles
  7. 14. used to describe B on a segment IFF it is between A and C and BA=CB
  8. 15. logical argument in which each statement you make is backed up by a statement that is accepted as true
  9. 16. two angles whose degree measures add up to 180
  10. 18. two angles who share a common vertex, a common side, but no common interior points
  11. 19. line or part of a line that intersects through a segment at its midpoint
  12. 22. the denial of a statement
Down
  1. 1. line or line segment added to a diagram to help in a proof
  2. 2. multiple points that lie on the same line
  3. 3. the denial of a statement
  4. 5. triangles that are the same size and same shape
  5. 7. a line intersects two or more lines at a different points on the same plane
  6. 8. two or more lines on the same plane that go on forever without intersecting
  7. 10. point, plane, space
  8. 11. a pair of adjacent angles whose noncommon sides are opposite rays
  9. 16. two or more lines do not intersect and are not in the same plane
  10. 17. closed figure in a plane that is made up of sides that intersect only at vertices
  11. 18. an unbroken part of a circle
  12. 20. points that lie in the same plane
  13. 21. an angle whose degree measure is less than 90