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Verified answer
Kesebangunan∆PQR dan ∆PST
QR // ST
sudut2 yg bersesuaian sama besar.
sudut S = sudut Q
sudut T = sudut R
QR/ST = PQ/PS
6/9 = PQ / (5 + PQ)
2/3 = PQ / (5 + PQ)
kali silang
3PQ = 10 + 2PQ
PQ = 10 satuan
PR/RT = 6/9
7/PT = 2/3
2PT = 21
PT = 10,5 satuan
PR = PT - 7 = 3,5 satuan