Geometry Crossword

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