Question

What is the cos of angle B?

Answer 1

`cos(B)=(5)/(13)`

Explanation:

Firstly, we will consider angle B

we can see that this is right angled triangle

adjacent side to angle (B) is BC

so,

`BC=5`

hypotenuse is AB

so,

`AB=13`

now, we can use cosine formula

`cos(B)=(adj)/(hyp)`

`cos(B)=(BC)/(AB)`

now, we can plug values

`cos(B)=(5)/(13)`