∫E is the midpoint of B 1C 1, and? EG and b 1 form an angle of 45,

∴? G point is at:? ①? One third of BB 1, while BG1=1/3bb1=1cm,

②? One third of CC 1, while CG2 = 1/3c 1, BG2= 1cm,

①? In △EFG 1, there are? EF=√？ [? (EC 1)& amp； sup2+(fc 1)& amp； sup2？ ]? =? 2√2,

EG 1=√？ [? (EB 1)& amp； sup2+(b 1g 1)& amp； sup2？ ]? =? 2√2,

FG 1=√？ [? (FB 1)& amp； sup2+(b 1g 1)& amp； sup2？ ]? =? √? [(fc 1)& amp； sup2+(c 1b 1)& amp； sup2+(b 1g 1)& amp； sup2]? =? 2√6,

What is the cosine theorem? cos∠FEG 1=？ 【(EF)& amp； sup2+(fg 1)& amp； sup2-(eg 1)& amp； sup2]? /? 2(EF)*(FG 1)

=? (√3)/2,

∴? ∠FEG 1？ =? 150 。

②? In △EFG2, there are? EF=√？ [? (EC 1)& amp； sup2+(fc 1)& amp； sup2？ ]? =? 2√2,

EG2=√？ [? (EC 1)& amp； sup2+(c 1g 2)& amp； sup2？ ]? =? 2√2,

FG2=√？ [? (fc 1)& amp； sup2+(c 1g 2)& amp； sup2？ ]? =? 2√2,

What is the cosine theorem? cos∠FEG2？ =? 【(EF)& amp； Sup2+(FG2) and ampsup2-(EG2) and ampsup2]? /? 2(EF)*(FG2)

= 1/2? ,

∴? ∠FEG2？ =? 60 。

I wish I could help you,