Geometry Crossword

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