Geometry Crossword

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Across
  1. 4. A seven-side figure
  2. 5. A four-side figure
  3. 6. A six-side figure
  4. 7. An angle less than 90 degrees
  5. 8. A shape with three sides
  6. 10. half of a line with one or two points
  7. 11. either of two angles whose sum is 90 degrees
  8. 13. An angle of more than 90 degrees
  9. 14. A ten-side figure
Down
  1. 1. either of two angles whose sum is 180°.
  2. 2. A shape with no sides
  3. 3. A eight-side figure
  4. 9. A five-side figure
  5. 12. half of a diameter