Across
- 8. ∡ABC=30°
- 12. formed by two rays
- 13. ⊥
- 14. degree
- 15. line that start from point A
Down
- 1. ∢AOB=30°
- 2. arcsecond, 1'=60"
- 3. ∥
- 4. line from point A to point B
- 5. same sapes, not same size
- 6. =90°
- 7. arcminute, 1°=60'
- 9. infinite line
- 10. arc from point A to point B
- 11. 1 turn=360°