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sin60/12 = sin90/PR
1/2√3 : 12 = 1/PR
PR = 12 : 1/2√3
PR = 6√3
sinP/QR = sinR/PQ
sin60/12 = sin30/PQ
1/2√3 : 12 = 1/2 : PQ
PQ = 1/2 X 12 : 1/2√3
PQ = 3√3