Cosine of an angle is the adjacent leg divided by the hypotenuse.
So cos(60) = a / 12
I'm going to assume it's your last option because it's not in the picture.
The 4 is the tenth million place
1 is 21
2 is 47
i'm not sure what 3 is but i think it's 1.5 or 3/2
4 is 5(n+9)
Lna^b = blna
let y = lne^e
so y = lne^e = e lne
lne = 1
y = e which is a constant (Euler's number) ~= 2.718
For Euler's number estimating methods request in a comment.
Answer:
111
Step-by-step explanation:
divide by 2 to find the radius
