In the triangle below, what is cos b?

Step-by-step explanation:

We have been given a triangle. We are asked to find .

We know that cosine relates adjacent side of a right triangle to its hypotenuse.

We can see that side AB is adjacent side and CB is hypotenuse of our given right triangle.

Therefore, our required value is

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

step-by-step explanation:

i am not sure sorry : c