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Verified answer
ST / TR = PQ / QRST / (QR - QT) = PQ / QR
ST / (12 - 4) = 5 / 12
ST / 8 = 5 / 12
ST = 5 / 12 x 8
ST = 40 / 12
ST = 10 / 3
maka panjang ST adalah 10/3 cm