Across
1. complement
6. sphere
7. center
10. integer
11 prism
12 area
14. postulate
15 cone
16. isosceles
20. compass
22 converse
23. axiom
24. unit
25. rectangle
29. arc (arc! arc!)
Down
1. concave
2. degree
3. real
4. geometry
5. inverse
8. congruence
9. diameter
12. acute
13. line
14. protractor
17. symmetry
18. bisector
19. ratio
20. circle
21. square
26. theorem
27. ruler
28. sum