Uni/Bi/Tri/Quad Affixes

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Across
  1. 4. Any animal with two legs
  2. 6. A one wheeled vehicle propelled by pedals
  3. 7. A fourth of an area
  4. 9. A mythical creature with one horn
Down
  1. 1. A three wheeled vehicle usually made for smaller kids before they ride bikes
  2. 2. being attracted to both genders
  3. 3. A group of usually about four
  4. 5. Bonus affix! A polygon with five sides
  5. 8. A three legged stand for holding a camera