Across
- 4. |x-y|
- 5. infinite line
- 9. triangle shape
- 11. 1 turn = 360deg
- 13. prime/ α = 60°59′59″
- 14. constant/ 3.141592654...
- 16. arc from point A to point B
- 17. grads angle unit
- 19. angle/ ∟
Down
- 1. ∆ABC~ ∆XYZ
- 2. angle/ AOB = 30°
- 3. ⊥
- 6. line that start from point A
- 7. segment/ line from point A to point B
- 8. arcminute, 1° = 60′
- 10. angle/ ABC = 30°
- 12. rad
- 15. to/ equivalence of geometric shapes and size
- 18. formed by two rays