Answer:
11. True
12. false
13. True
14. False
15. true
16. True
sry if number 15 & 16 are wrong,
17. Line AE, Line FE, Line HE
18. Plane ABCD
19. Plane ABCD , Plane CDHG
20. Plane CDHG, Plane ABCD, Plane ADHE
hope this helps :)
