Geometry Crossword

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Across
  1. 2. a 3-sided shape
  2. 3. the distance around a circle
  3. 6. a 90 degree angle
  4. 9. a shape with 4 right angles and 4 equal sides
  5. 11. an angle more than 180 degrees
  6. 12. a 9-sided shape
Down
  1. 1. a 4-sided shape
  2. 4. an angle less than 90 degrees
  3. 5. any closed shape
  4. 7. a 8-sided shape
  5. 8. an angle greater than 90 degrees
  6. 10. a 10-sided shape