In a two-dimensional stress analysis, the state of stress at a point is shown in the figure. The values of length of $\text{PQ, QR,}$ and $\text{RP}$ are $4, 3,$ and $5$ units, respectively. The principal stresses are ___________ . (round off to one decimal place)
- $\sigma_{\mathrm{x}}=26.7 \mathrm{~MPa}, \sigma_{\mathrm{y}}=172.5 \mathrm{~MPa}$
- $\sigma_{\mathrm{x}}=54.0 \mathrm{~MPa}, \sigma_{\mathrm{y}}=128.5 \mathrm{~MPa}$
- $\sigma_{\mathrm{x}}=67.5 \mathrm{~MPa}, \sigma_{\mathrm{y}}=213.3 \mathrm{~MPa}$
- $\sigma_{\mathrm{x}}=16.0 \mathrm{~MPa}, \sigma_y=138.5 \mathrm{~MPa}$