We need to find the ratio of $r$ over $h$, which is $\frac{1.875}{1.25} = 1.5$. We also need to find the ratio of $r$ over $h$, which is $\frac{0.25}{1.25} = 0.2$. From a textbook, we find that the value of $K$ is $1.75$. The allowable stress is $\sigma_{\text
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