bantu jawab kk setor bsok

ST/PQ = RT/QR

15/18 = RT/(RT + 2)

5/6 = RT/(RT + 2)
6RT = 5(RT + 2)
6RT = 5RT + 10
6RT - 5RT = 10
RT = 10

Jadi QR = RT + QT
              = 10 + 2
              = 12 cm