Question

Find the value of x. Round to the nearest tenth. х 12 4 X = = [ ? ]

Answer 1

Use cosine trigonometric relation.

$Cos~x=\frac{Adjacent} {Hypotenuse} \\\\ \to cos~x=\frac{4}{12} \\\\ \to cos~x= \frac{1}{3} \\\\ x=arccos(\frac{1}{3})\\\\ x \approx 70°$