Word Work: bi, tri, quad

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Across
  1. 3. glasses with three parts
  2. 4. three colors
  3. 5. bike with two wheels
  4. 6. three babies born at the same time to the same mother
  5. 7. shape with four sides and four angles
  6. 9. two colors
  7. 10. speaks two languages
Down
  1. 1. glasses with two parts
  2. 2. every two weeks
  3. 3. dinosaur with three horns
  4. 6. group of four performers
  5. 8. plane with two levels of wings