Geometry Crossword

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Across
  1. 5. angles opposite each other when two lines cross
  2. 6. a flat surface that extends infinitely far, it is an analogue of a point.
  3. 7. the value of a sentence is "true" of "false", A sentence of the form "if A then B" is true unless A is true and B is false.
  4. 8. two angles whose sum equals 180 degrees
  5. 10. two lines that have the same length
  6. 11. two shapes that are the exact same size and shape
Down
  1. 1. property of a mathematical relation such that if the relation holds between a=b, and b=c then we know a=c
  2. 2. two angles whose sum equals 90 degrees
  3. 3. any geometric figure is congruent to itself
  4. 4. angles that have the same angle, usually in degrees or radians
  5. 9. points that are all in the same plane