Geometry Crossword

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Across
  1. 4. A surface that is flat and goes on forever
  2. 7. Angles that share the same side
  3. 9. A triangle with all angles equal to each other
Down
  1. 1. The exact middle
  2. 2. Lines that will never touch
  3. 3. A triangle with one angle measuring 90 degrees
  4. 4. Something that has been proven true a long time ago
  5. 5. Of the same length
  6. 6. Made up of part of a line and two endpoints
  7. 8. 2 angles that when added together equal 180 degrees