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b. QR = PR/PT × TS = 12/8 × 10 = 15 cm
c. PS = a
PT/PR = PS/PQ
8/12 = a/(a+6)
2/3 = a/(a+6)
2:3 = a:(a+6)
selisih 2:3 = 1
selisih a:(a+6) = 6
jadi, PS = 2×6 = 12, PQ = 12+6 atau 3×6 = 18