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QU = 2/3 (QP - QU)
3.QU = 2 (QP - QU)
3.QU = 2 QP - 2QU
2.QP = 2.QU + 3.QU
2 QP = 5 QU
QU : QP = 2 : 5
lihat Δ PQR dengan UT // PR
QU : QP = UT : PR
2 : 5 = UT : 15
5 .UT = 2 . 15
5.UT = 30
UT = 30/5
UT = 6 cm
US = PR = 15 (PRSU jajar genjang)
TS = US - UT
= 15 - 6
= 9 cm