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Verified answer
Kubus ABCD.EFGHrusuk = 6
AP : PB = 2 : 1
EF'/EF = EQ/ER = 1/(1+2) = 1/3
ER = 1/2 EG = 1/2 . 6√2 = 3√2
EQ = 1/3 ER = √2
Panjang proyeksi AF ke bidang ACGE = AQ
AQ = √(AE² + EQ²)
AQ = √(6² + 2)
AQ = √38 ---> opsi C