Across
2. complementary
6. pi
8. geometry
9. median
10. ruler
11. compass
12. converse
14. rectangle
17. degree
18. protractor
20. isosceles
Down
1. coincide
2. concave
3. lion
4. exterior
5. bisector
7. axiom
11. congruence
12. circles
13. postulate
15. theorems
16. square
19. real