uni, bi, tri, quad

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Across
  1. 3. A mythical horse with one horn
  2. 7. Something that helps you see far with two lenses
  3. 9. A group of four babies born at the same time
  4. 11. A three-sided shape
Down
  1. 1. A shape with four sides
  2. 2. When people speak or sing together
  3. 4. A three-sided shape
  4. 5. An animal that walks on two feet
  5. 6. An animal that walks on four legs
  6. 8. A stand with three legs
  7. 10. A vehicle with one wheel