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PS/PR = PT/PQ
9/(12+TR) = 12/(9+11)
9/(12+TR) = 12/20
terus kaliin silang,jadinya
180 = 144 + 12 TR
180-144 = 12 TR
36 = 12 TR
TR = 3 cm
yg nomer 26 gak kelihatan
PQR dan PST
PR = PS
PQ = PT
QR = ST
PR?
PQ/PT = PR/PS
20/12 = PR/9
5/3 = PR/9
5.9/3 = PR
45/3 = PR
15 = PR
PR = 12 + x
15 = 12 + x
3 = x
3 = TR