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14. karena segitiga sama sisi maka AB = AC = BC dan TC = TB
TC² = TA² + AC²
TC² = 4² + (4√2)²
TC = √48
TC = 4√3
misalkan D merupak titik tengah BC
TD² = TC² + DC²
TD² = (4√3)² + (2√2)²
TD = √56
TD = 2√14
buatlah segitiga siku siku TAD siku siku di A dan α di sudut ADT
sin α = TA / TD
sin α = 4 / 2√14
sin α = 1/7 √14 (menurut saya)