Across
- 2. two-dimensional closed figure made up of straight line segments connected end-to-end
- 7. thirteen sides
- 9. two pairs of adjacent congruent sides
- 12. ten sides
- 13. four equal sides
- 14. three sides
- 16. eleven sides
- 17. six sides
- 18. both pairs of opposite sides are parallel lines never intersect
Down
- 1. twelve sides
- 3. nine sides
- 4. five sides
- 5. one line that is not straight
- 6. four right angles
- 8. four equal sides
- 10. eight sides
- 11. four equal sides and four right angles
- 14. exactly one pair of parallel sides
- 15. twentythree sides
- 17. seven sides