Across
- 3. polygon with eight sides
- 5. proof proof that uses indirect reasoning
- 6. having all equal sides
- 8. polygon with three sides
- 9. triangle triangle with a 90 degree angle
- 10. polygon with four sides
- 11. having all angles equal
- 12. angle angle measuring 89 degrees or less
- 15. quadrilateral with opposite sides parallel
- 16. angles that add to 180 degrees
Down
- 1. used to prove something to be correct
- 2. that add to 90 degrees
- 4. polygon with six sides
- 7. triangle triangle with two sides congruent
- 13. angle angle measuring 91 degrees or more
- 14. polygon with five sides
- 17. segment part of a line
- 18. a line extending from one point forever in one direction