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Segitiga PTS sebangun segitiga QTR, sebab,sudut RTQ = sudut STU (bertolak belakang)
sudut SPQ = sudut TQR (dalam berseberangan).
sudut PST= sudut QRT (dalam berseberangan/ jumlah sudut sehingga 180° )
misal PT = x, maka TQ = 60 -x,
PS : PT = QR : TQ
35 : x = 15 : (60-x)
35.(60-x) = 15.x
2.100 - 35x = 15x
2100 = 15x + 35x
50x = 2100
x = 2.100/50
x = 42 cm
Jadi panjang PT = 42 cm,