Mathematics
OpenStudy (anonymous):

How do you find surface area of a cylinder

OpenStudy (anonymous):

Do you want me to do an example?

OpenStudy (anonymous):

yes?

OpenStudy (katrinakaif):

Surface Area of a Cylinder: $2\pi r^2 + 2\pi rh$

OpenStudy (katrinakaif):

OpenStudy (anonymous):

the net for a cylinder is two circles and a rectangle. Since you have two circular ends of the cylinder, you'll have to find the area of those two circles. to find the lateral surface area, you'll need the circumference of the circle ends. This will be your length of the rectangle. then multiply this with the height of the cylinder. then add area of the two circles + area of the rectangle.

OpenStudy (anonymous):

For a closed cylinder of radius r and height h$A(r,h)=2 \pi r^2+2 \pi rh$

OpenStudy (anonymous):

|dw:1331591723955:dw|

OpenStudy (anonymous):

And it says to use pi

OpenStudy (anonymous):

3.14

OpenStudy (katrinakaif):

Can you please specify if 108 stands for 'h' and 3 stands for the SA of the circle?

OpenStudy (anonymous):

That is all it tells me. but3 is ft. and 108 is inches

OpenStudy (anonymous):

I have a test tommorow and we just learned it today and it confuses me

OpenStudy (anonymous):

|dw:1331592194041:dw| ok so you'll need to change the 3 ft to 36 inches. I'm assuming from the pic that it is your diameter. to find the area of the circular ends, Area = pi*radius^2 to find the circumference, C = 2*pi*radius