Question

What is the value of cos(A) in the diagram?

Select one
40/9
9/40
9/41
40/41

Answer 1

The answer is option 3.

Explanation:

Given that the formula for Cosine Rule is cosθ = adjacent/hypotenuse. So you have to substitute the following values into the formula :

`\cos(θ) = (adj.)/(hypo.)`

Let θ = A,

Let adj. = 9,

Let hypo. = 41,

`\cos(A) = (9)/(41)`