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gunakan perbandingan PT/PQ = PS/PR》12/9+11 = 9/12+TR》12/20 = 9/12+TR》6/10 = 9/12+TR
dikalisilangkan menjadi: 6(12+TR) = 90》72+6TR=90》6TR=90-72》6TR=18》TR=18/6= 3cm