Question

Based on the figure, which of the following equations is also true?

Answer 1

Answer:

The correct answer is B.

Step-by-step explanation:

Because you know two of the angles in a triangle are 90° and 52°, you can infer that the third angle is 38°. There is a trigonometry rule that states the sine of an angle is equivalent to the cosine of 90° minus that angle, which you can apply to here. Since $Sin(52$°$)$ = $\frac{17}{c}$, you know that $Cos(90$°$-52$°$)$ or $Cos(38$°$)$also equals $\frac{17}{c}$, so choice B is the correct answer.