can someone help me with surface area of a cylinder calculations

Question

owlfred · Answer

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

anonymous · Answer

4r 10 h

amistre64 · Answer

whatcha got?

anonymous · Answer

i need help with surface area of a cylinder the question is 4 r and 10 h. i dont underrstand how to calculate it

amistre64 · Answer

radius=4 and height=10?

amistre64 · Answer

the surface of a cylindar is the circumferenceof the base times its height

amistre64 · Answer

c=2pi r

8pi in this case

8pi * 10 = 80pi for the sides

amistre64 · Answer

if you  include the tops and bottoms you figure in for area

amistre64 · Answer

pi r^2 = area ;  4pi for the top and 4pi for the bottom for a total area of 88pi

amistre64 · Answer

ack.....

amistre64 · Answer

4^2 = 16 not 4 ....

80+32 = 112

112pi

anonymous · Answer

let me make sure i understand this befor you go please

amistre64 · Answer

im here

anonymous · Answer

4 X 4= 16 how did you get 8 pie

amistre64 · Answer

the edge of a circle equals:  2pi r  , the sides of your cylinder are just the outside edge of a circle streched up to 10 right?

2pi (4) = 8pi

8pi (10) = 80pi

that is the area of your sidewalls

amistre64 · Answer

you agree?

anonymous · Answer

im in the 7th grade and trying to understand im sorry

amistre64 · Answer

what do you have questions about?

amistre64 · Answer

i cant read your mind, no matter what grade your in :)

anonymous · Answer

and you are good  at it. thanks for your patience. 
so they way got the answer is 4X4=16 and then you added 4+4 =8 X 10 = 80 +32 = 112 X 3.14 = 351.68 correct

amistre64 · Answer

yes, that looks to be about right...

anonymous · Answer

thank you so much i think i got it. you have been very helpfull to me. have a great weekend.

amistre64 · Answer

youre welcome :)