Across
- 5. 8 sides
- 7. S=(n-2)×180
- 9. 3 sides
- 12. a closed shape with straight sides
- 13. angle bisectors intersect at a point
- 15. 4 sides
- 16. angles sum up to 90 degrees
- 18. sides are equal
- 19. all vertices point toward the center
- 20. three medians intersect at one point
Down
- 1. all sides and angles are the same
- 2. 10 sides
- 3. 12 sides
- 4. altitudes
- 6. 7 sides
- 8. sum is always 360 degrees
- 10. two angles next to each other equals 180 degrees
- 11. lines that are the same distance apart and never intersect
- 14. perpendicular bisectors of the sides intersect at a point
- 17. all vertices point away from the center