Geometry Crossword Puzzle

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Across
  1. 3. greater than 90 but less than 180 degrees
  2. 4. less than 90 degrees
  3. 7. it has arrows on two sides
  4. 8. same sized sides
  5. 9. it has one arrow and one point
  6. 10. angle of 90 degrees
  7. 11. makes exactly 90 degrees.
Down
  1. 1. they make V's
  2. 2. measures 180 degrees
  3. 5. is 360 degrees
  4. 6. half of a circle
  5. 12. they never meet