Box

Calculate the angle between box base 9 x 14 and body diagonal length 18.

α =  22.39 °

Step-by-step explanation:

$\alpha =\frac{180}{\pi }\mathrm{arccos}\left(\frac{\sqrt{{9}^{2}+1{4}^{2}}}{18}\right)=22.3{9}^{\circ }$

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