Mathematics: The equation cos−1 = x can be used to determine the measure of angle bac. what is the degree measure of angle bac? round to the nearest whole degree.

The equation cos−1 = x can be used to determine

Katie123amazing

10.01.2022

we know that

in the right triangle ABC

the value of cosine of angle x is equal to

$cos(x)=\frac{AC}{AB}$

we have

$AC=3.4\ cm\\AB=10\ cm$

substitute the values

$cos(x)=\frac{3.4}{10}=0.34$

Find the measure of angle x

$x=cos(x)^{-1} =arc\ cos(0.34)=70.12\°$

Round to the nearest whole degree

$x=70\°$

therefore

the answer is

$70\°$

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