minta bantuannya no.3, jawab yg bener ya

Kubus ABCD.EFGH
rusuk = 2

S titik tengah PQ
GS = 1/2 √2

T titik tengah DB
TC = 1/2 AC = 1/2 . 2√2 = √2

TU = TC - UC = √2 - 1/2 √2 = 1/2 √2

TS = √(TU² + SU²)
TS = √((1/2 √2)² + 2²)
TS = √(1/2 + 4)
TS = √(9/2)
TS = √(9 . 2/(2 . 2))
TS = (3/2)√2

sin θ = SU/TS
sin θ = 2/(3/2)√2
sin θ = (2/3)√2 --> opsi B