Question

For the following triangle, calculate the indicated trigonometric ratio of the given angle.

Answer 1

$cos\text{ 39=}\frac{109}{140}$

Explanation

the cosine of any angle is given by

$\cos\theta=\frac{adjacent\text{ side}}{hypotenuse}$

hence

Step 1

a) let

$\begin{gathered} adjacent\text{ side=109} \\ hypotenuse=140 \\ angle\text{ = 39\degree} \end{gathered}$

replace,

$cos\text{ 39=}\frac{109}{140}$

I hope this helps you