Question

in right triangle DEF, cos D = 12/17. the measure of angle D, to the nearest 10th of a degree, is _____.

Answer 1

If:

$\cos D=\frac{12}{17},$

then:

$D=\cos ^{-1}(\frac{12}{17}).$

Therefore:

$D\approx45.1^{\circ}\text{.}$

Answer:

$45.1^{\circ}\text{.}$