According to your diagram, PQR triangle is a right angled triangle. In a right angled triangle,
`sin(49) = (QR)/(PR)`
`0.7547 = (QR)/12.38`
QR = 12.38 * 0.7547 cm
QR = 9.343186 cm.
Therefore the length of QR is 9.34 cm to the nearest hundredth of a centimeter.
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