Question

Find the cosine of angel R. Reduce the answer to the lowest terms.

Answer 1

The Solution:

Given the right-angled triangle below:

We are asked to find the cosine of angle R.

Using the Trigonometrical Ratio below:

`\begin{gathered} \cos R=\frac{\text{adjacent}}{\text{hypotenuse}}=(RT)/(RS)=(6)/(10)=(3)/(5) \\ \end{gathered}`

Thus, the cosine of angle R is 3/5.

Therefore, the correct answer is 3/5