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TB = √TA² + AB²
= √6²+(2√3)²
= √36+12
= √48
= 4√3
BC = √AB²+AC²
= √(2√3)²+(2√3)²
= √12+12
= √24
= 2√6
Garis tinggi TBC = TO = √TB²-(1/2 BC)²
= √(√48)²-(1/2 2√6)²
= √48 - 6
= √42
sehingga sin α = TA / TO
= 6 / √42
= 6/42 √42
= 1/7 √42