Question

Let me get some help real quick big fella​

Answer 1

The answer is A
You have to use the trigonometric ratio as it is a right angle triangle.

Answer 2

cos B = 9/41

Explanation:

Using trig functions, since we have a right angle,

cos theta = adjacent side/ hypotenuse

Cos B = 18/82

Dividing the right side by 2

cos B = 9/41