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SR/QR = RT/RP
12/21 = 8/(PS+SR)
12/21 = 8/PS+12
168 = 144 + 12PS
24 = 12 PS
PS = 2cm
24)
bagian bawah = x
18/8 = 24/(19-x)
192 = 342 - 18x
18x = 150
x = 8.1/3 cm