On a straight stretch of road is marked 12 percent drop. What angle makes the direction of the road with the horizontal plane?

Correct result:

x =  6.8428 °

#### Solution:

$x=\frac{18{0}^{\circ }}{\pi }\cdot \mathrm{arctan}\left(12\mathrm{/}100\right)=6.842{8}^{\circ }={6}^{\circ }5{0}^{\mathrm{\prime }}34\mathrm{"}$

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