If a cylindrical water tank has the dimensions shown in the figure, calculate the amount of sheet metal needed to create this tank. (Hint: Calculate the surface area of the cylinder.)

Question

anonymous · Answer

attachment

mathhelp346 · Answer

to find surface area you find the area of all the shapes

mathhelp346 · Answer

hold on

anonymous · Answer

Surface = $$2\pi r( r + h )$$

$$2\pi 3.5 ( 3.5 + 10) = 296.73 $$

mathhelp346 · Answer

Surface of a Cylinder= Circumference*height

anonymous · Answer

it's a CLOSED cylinder :)

mathhelp346 · Answer

Circumference=3.14*7
=21.98

Surface Area= 21.98*10
=219.8

anonymous · Answer

SURFACE AREA= 2 pi r h +2 pi*r^2 = 2*3.14*3.5*10 + 2*3.14*(3.5)^2 = 296.73
square meters

anonymous · Answer

it's a closed cylinder, you have to add the area of the lids

anonymous · Answer

SurfaceArea = AreaOfTop + AreaOfBottom + AreaOfSide

AreaOfTop = AreaOfBottom 

so then: 
SurfaceArea =  AreaOfTop + AreaOfTop + AreaOfSide = 2*AreaOfTop + AreaOfSide

$$AreaOfTop = AreaOfACircle = \pi r^2 = \pi 3.5^2 $$
diameter = 7
radius = 3.5

AreaOfSide = length*height
height = 10
$$length = CircumferenceOfACircle = 2 \pi r = 2 \pi 3.5$$

anonymous · Answer

what

anonymous · Answer

i am sorry but i do not understand.

mathhelp346 · Answer

Circumference=3.14(π)*7 =21.98 Surface Area= 21.98*10 =219.8

mathhelp346 · Answer

do you understand?

anonymous · Answer

well thats not the right answer because its not an option

mathhelp346 · Answer

umm then...idk

anonymous · Answer

well thank u for trying