a painter is hired to paint a silo that had the dimmensions shown below. one gallon of paintcovers 400 square feet. how many gallons of paint does the painter need?
*please wait while i draw the figure

- anonymous

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- anonymous

|dw:1327633952599:dw|

- anonymous

2(22/7)r = (44/7)(15)=660/7feet^2
this is the bottem of the container (ill make it into decimals later)

- anonymous

oh sry :P

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## More answers

- anonymous

that is circumference of the bottem. Now we'll find the area of the middle section of the silo by multiplying it by 40 to get
(660/7)(40)=26400/7
its more accurate to wait till the very end to round it off but if your still in high school then i guess you can round it off to 2 dec one time

- anonymous

ok now to find the area of the bottem
(22/7)r^2
(22/7)(15)^2
(22/7)(225)
4950/7

- anonymous

okay so, the circumference is 94.28?

- anonymous

94.29
not 94.28

- anonymous

okay:)
so the middle part is 3771.42, right?

- anonymous

no its 3771.43
because 3771.428 is closer to 3771.43 than 3771.42

- anonymous

sorry :p
so, on the 3rd explanation what do you mean by bottom?

- anonymous

the bottom of the silo, in other words the circle with radius 15

- anonymous

with the circumference of 94.3?

- anonymous

yes

- anonymous

but make it two dec places not 1

- anonymous

okay.
so do i need to do anythign wih that triangle above the silo??

- anonymous

for the area of the middle section dont use fractions then put
94.29x40 = 3771.6

- anonymous

yes you do were actually only half way through this question

- anonymous

okay.

- anonymous

and the area for the bottom is
4950/7 = 707.14

- anonymous

bottom of silo?

- anonymous

si :)

- anonymous

lol okay:)
so now the pyramid thing. what ami supposed to do?

- anonymous

for the cone at the top now this is just something u have to learn. A cone is also a semi circle and the 17feet is the radius of that semi circle

- anonymous

okay

- anonymous

so (1/2)(22/7)r^2
(11/7)(17^2)
(11/7)(289)
3179/7
454.14

- anonymous

whats that?

- anonymous

the area of the pyramid at the top (cone) which is 454.14feet^2

- anonymous

okay:)

- anonymous

u understood wat i did?

- anonymous

please explain.

- anonymous

\[1/2( \pi r ^{2})\]

- anonymous

|dw:1327636571579:dw|
so we find the area of the circle and then divide it by 2 using that formulae

- anonymous

okay. :)
so now we add both answers to get the whole thing, right?

- anonymous

i see.

- anonymous

all 3 yes

- anonymous

3? we have the bottom of silo and pyramid.

- anonymous

oh

- anonymous

also the middle section

- anonymous

454+3771+707.14?

- anonymous

where u got 454? and it is 3771.6

- anonymous

sorryabout the .6:)
i thought the 454 was the area of the pyramid?

- anonymous

oh yes my bad and its 454.14 feet
dont forget about the dec places

- anonymous

all right. :)

- anonymous

and then we divide by 400?

- anonymous

so 707.14+454.14+3771.6=
4932.88feet^2

- anonymous

and yes

- anonymous

yes. :)

- anonymous

therefore to conclude this confusing and long question
4932.88/400=
12.3322 gallons

- anonymous

also dont forget to put units and decimal

- anonymous

yes.
thank you hawkcrimson. for the patience? lol
thanks:)
and i won't forget te decimals :)

- anonymous

im watching u like a hawk so u better not :P

- anonymous

bahahaha lol. i won't :D

- anonymous

kk take care bye

- anonymous

bye and thanks:)

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