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

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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

Mathematics
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|dw:1327633952599:dw|
2(22/7)r = (44/7)(15)=660/7feet^2 this is the bottem of the container (ill make it into decimals later)
oh sry :P

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Other answers:

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
ok now to find the area of the bottem (22/7)r^2 (22/7)(15)^2 (22/7)(225) 4950/7
okay so, the circumference is 94.28?
94.29 not 94.28
okay:) so the middle part is 3771.42, right?
no its 3771.43 because 3771.428 is closer to 3771.43 than 3771.42
sorry :p so, on the 3rd explanation what do you mean by bottom?
the bottom of the silo, in other words the circle with radius 15
with the circumference of 94.3?
yes
but make it two dec places not 1
okay. so do i need to do anythign wih that triangle above the silo??
for the area of the middle section dont use fractions then put 94.29x40 = 3771.6
yes you do were actually only half way through this question
okay.
and the area for the bottom is 4950/7 = 707.14
bottom of silo?
si :)
lol okay:) so now the pyramid thing. what ami supposed to do?
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
okay
so (1/2)(22/7)r^2 (11/7)(17^2) (11/7)(289) 3179/7 454.14
whats that?
the area of the pyramid at the top (cone) which is 454.14feet^2
okay:)
u understood wat i did?
please explain.
\[1/2( \pi r ^{2})\]
|dw:1327636571579:dw| so we find the area of the circle and then divide it by 2 using that formulae
okay. :) so now we add both answers to get the whole thing, right?
i see.
all 3 yes
3? we have the bottom of silo and pyramid.
oh
also the middle section
454+3771+707.14?
where u got 454? and it is 3771.6
sorryabout the .6:) i thought the 454 was the area of the pyramid?
oh yes my bad and its 454.14 feet dont forget about the dec places
all right. :)
and then we divide by 400?
so 707.14+454.14+3771.6= 4932.88feet^2
and yes
yes. :)
therefore to conclude this confusing and long question 4932.88/400= 12.3322 gallons
also dont forget to put units and decimal
yes. thank you hawkcrimson. for the patience? lol thanks:) and i won't forget te decimals :)
im watching u like a hawk so u better not :P
bahahaha lol. i won't :D
kk take care bye
bye and thanks:)

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