Question

The equation cos super negative 1 (StartFraction 3.4 Over 10 EndFraction)equals x can be used to determine the measure of angle BAC.
Triangle A B C is shown. Angle A C B is a right angle. The length of hypotenuse A B is 10 centimeters and the length of A C is 3.4 centimeters. Angle C A B is x.




What is the degree measure of angle BAC? Round to the nearest whole degree.


19°

20°

70°

71°

Answer 1

Answer: the anwser is 70 degrees

Step-by-step explanation:

Answer 2

Answer:

70 degrees

Step-by-step explanation:

$cos^{-1} \frac{3.4}{10}=x$

This implies that:  $cos x= \frac{3.4}{10}$Recall: $cos x=\frac{adjacent}{hypotenuse}$

From the diagram

Angle CAB,  $x=cos^{-1} \frac{3.4}{10}=70.1 degrees$=70 (to the nearest degree)