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PR/UT = QP/QU
15/UT = (2/3UP + UP)/ 2/3 UP
15/UT = 5/2
5 UT = 30
UT = 6 cm
selanjutnya cari panjang TS
PR = US = UT + TS
15 = 6 + TS
TS = 9 cm
Jadi panjang TS adalah 9 cm