The solid is similar to a larger solid with the given scale factor. find the surface area and the volume of the larger solid

- anonymous

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- anonymous

##### 2 Attachments

- anonymous

hm, well i answered your other question straight up, so if you can figure out how i got that, then you might be able to do this...

- anonymous

so you just have to multiply the volume by the scale left hand side and right hand side

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## More answers

- anonymous

sorry
divide by left side, multiply by right side... thats how scales work

- anonymous

so for the rectangle, the new scale factor would be 9:27...

- anonymous

well you only need the volume right? so take the volume of the rectangle prism (495) then divide by 1 and multiply by 3 because its 1:3

- anonymous

i need the surface area and volume

- anonymous

is that whats on the side? S and V?

- anonymous

yea

- anonymous

ok so you only need to use those and the scale to work it out... so say i have a S=6 and scale 2:6 my S=(6/2)*6=18 can you relate that to the question you have??

- anonymous

so i would do (3/1)*398

- anonymous

no, you would do (398/1)*3

- anonymous

i chose bad numbers, which were easy to mix up sorry

- anonymous

so the surface area would =1194in^2

- anonymous

yes

- anonymous

would it be the same for volume?

- anonymous

yeah, you do it the same way. cause they already gave you the volume, just in the wrong scale... so its (495/1)*3 which i know you can do... so what is the answers for teh rectangle?

- anonymous

1485in^3

- anonymous

yeah, but what about the other picture... can you tell me the answers for that? you just do it the same way.

- anonymous

(144*pi/3)*2=301.44cm^2

- anonymous

thats not the same way.

- anonymous

oh wait, is that blurry thing pi? if so then yeah thats right

- anonymous

it says 144 pi cm^2 for the surface doesn't it?

- anonymous

yea it is

- anonymous

ok cool, you got it congrats :)

- anonymous

(288*pi/3)*2=602.88cm^3

- anonymous

oh no
its ((144*pi)/2)*3 sorry... so close, but it was just a small error

- anonymous

Surface are= 678.24cm^2

- anonymous

yep, final answer :)

- anonymous

volume=1356.48cm^3

- anonymous

yes. what are you in like grade 8? doing better than i was then...

- anonymous

no

- anonymous

lower grade?

- anonymous

im actually a senior

- anonymous

i'd count grade 8 as senior :( scales took me ages was my point anwyay

- anonymous

oh okay

- anonymous

and you got the powers right which was pretty cool :P

- anonymous

thank you for ur help

- anonymous

no problem

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