ill medal whoever answers!!

Find the total area for the cylinder with the given measurement.

r = 2, h = 4
16pi
20pi
24pi

Question

ill medal whoever answers!!

Find the total area for the cylinder with the given measurement.

r = 2, h = 4
16pi
20pi
24pi

.sam. · Answer

When you open a cylinder, you will get 2 circles and a rectangle. The area of a circle is $\pi r^2$, we have two circles so $2 \pi r^2$ and the area of that rectangle is $2 \pi r h$.
Add them up we get
$$A=2 \pi r^2 + 2 \pi r h$$
Now you have $r$ and $h$, can you find the area?

obviouslyhes · Answer

i got 75.36. is there another step after that to get the final answer?

.sam. · Answer

Nope, it is done.

obviouslyhes · Answer

but one of the answers has to be 16pi, 20pi, or 24pi.

mathmale · Answer

I agree with Sam's formula for the total surface area of your cylinder:$$A=2 \pi r^2 + 2 \pi r h$$

mathmale · Answer

Would you please show your work?  It'd then be easier for someone to give you feedback.

thesmartone · Answer

Your answers are exact.

Plug in r = 2 and h = 4 in to the equation

BUT do absolutely nothing to $\pi$. 

Because your final answer contains pi, we don't want to get rid of it by doing pi = 3.14 and plugging that in.

So plug in r = 2 and h = 4 and simplify what you get without touching pi :)