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PA = PR/2
PA = (a√2) / 2
TA² = TP² + PA²
= a² + a²/2
TA = √(3a²/2)
= (a√6) / 2
nanti akan terbentuk segitiga siku - siku TPA. sudut α terletak pada sudut TOP
sin α = TP/TA
= a/ ((a√6) / 2)
= (√6) / 3.
selesai