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Verified answer
Kubus•ABCD.EFGH
rusuk = x
EG = diagonal sisi kubus = x√2
EP = 2/3 EG = 2/3 x√2
AP = √(AE² + EP)²
AP = √(x² + 8/9 x²)
AP = 1/3 x √17
Jarak E ke AP = y = 2a
Perhatikan ∆AEP
y × AP = AE × EP
2a × 1/3 x√17 = x × 2/3 x√2
a√17 = x√2
x = a√17 /√2
x = a/2 √34
Opsi : B