Answer:
1. AK
2. AK
3. BE
4. AE
5. <A
6. 180°
7. supplementary (180°)
8. + <K
9. ∆BAK
10. BK
(i'm not really sure about my answer in 7 and 8, but they still make sense. since 7. <A + <K = 180°, then it means it's supplementary. 8. <B + <K and <E + <K -- both of them are equals to 180°)
