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Math·Geometry and Trigonometry·Right triangles and trigonometry

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According to a US law, ramps for use by the general public must form an angle with level ground such that $\tan \theta \le \frac{1}{12}$. If the ramp in the figure conforms to this law and has a height of $29.1$ inches, what is the least possible value of $x$, in inches?

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