Question

I need help with regarding an expression

Answer 1

The diagram shows a right triangle with the hypotenuse measuring 6, and the adjacent BC unknown. The adjacent is the side that lies between the reference angle and the right angle.

With the reference angle given as 55 degrees, and the hypotenuse given as 6 units, the adjacent BC can be calculated as follows;

`\begin{gathered} \cos 55=\frac{\text{adj}}{\text{hyp}} \\ \cos 55=\frac{\text{adj}}{6} \\ \text{Cross multiply and you have;} \\ \cos 55*6=\text{adj} \\ \text{Therefore, line BC is represented by} \\ BC=6\cos 55 \end{gathered}`

The first option is the correct answer