In order to calculate the volume of a cylinder, we can use the following formula:

Where r is the base radius and h is the height.
If the circumference is 8, we have:

Now, calculating the volume, we have:

So the correct option is the second one.
x^2 + 4x + 3 + 1 = (x + 2)^2
So 1 need to be added.
Answer:
your answer is going to be B: Obtuse