anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1327633952599:dw|
anonymous
  • 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
  • anonymous
oh sry :P

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

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