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Mathematics 10 Online
OpenStudy (anonymous):

Two similar solids are shown below. What is the volume of the larger solid?

OpenStudy (anonymous):

OpenStudy (anonymous):

2624 ft3 1312 ft3 5248 ft3 4386 ft3

OpenStudy (anonymous):

@lgbasallote

OpenStudy (lgbasallote):

first, do you know what is the ratio of the SIDE of the smaller solid to the larger solid?

OpenStudy (anonymous):

is it 2:4

OpenStudy (lgbasallote):

right

OpenStudy (lgbasallote):

the ratio of their volumes will be the cube of that... so what is 2^3 : 4^3 simplified?

OpenStudy (lgbasallote):

\[\huge \Uparrow 2^3 : 4^3\]

OpenStudy (anonymous):

1/8

OpenStudy (lgbasallote):

no...do it individually..what is 2^3

OpenStudy (anonymous):

8

OpenStudy (lgbasallote):

and what is 4^3

OpenStudy (anonymous):

64

OpenStudy (lgbasallote):

good so the ratio of the volumes will be 8 : 64 now use proportionality the volume of the smaller cube is 328 so... \[\huge \frac {8}{64} = \frac{328}{x}\] solve for x

OpenStudy (anonymous):

2624

OpenStudy (anonymous):

how did you get 328

OpenStudy (lgbasallote):

it's given

OpenStudy (anonymous):

nevermind

OpenStudy (lgbasallote):

look at the attachment

OpenStudy (lgbasallote):

lol

OpenStudy (anonymous):

i know

OpenStudy (anonymous):

do u think u can help me with just one more

OpenStudy (lgbasallote):

sure

OpenStudy (anonymous):

great!!

OpenStudy (lgbasallote):

just tag me when you're ready

OpenStudy (anonymous):

everything is in the attachment

OpenStudy (anonymous):

@lgbasallote

OpenStudy (lgbasallote):

\[\huge LSA = \frac{ps}{2}\] where p = perimeter of the base s = slant height does that help?

OpenStudy (anonymous):

kind of

OpenStudy (lgbasallote):

good. try and answer it. then when you have an answer let me check

OpenStudy (anonymous):

so i find the lateral area

OpenStudy (lgbasallote):

yes

OpenStudy (lgbasallote):

remember that the base is an equilateral triangle so the perimeter is just 3b b = base edge

OpenStudy (anonymous):

is the answer 72??

OpenStudy (lgbasallote):

how did you get 72?

OpenStudy (anonymous):

I am not really sure this question confuses me

OpenStudy (lgbasallote):

okay first...what is the perimeter of the base?

OpenStudy (anonymous):

16

OpenStudy (lgbasallote):

remember...the base is an equilateral triangle...so the perimeter is 3 x length of base

OpenStudy (lgbasallote):

the base edge is 4... so what is 3 x 4?

OpenStudy (anonymous):

12

OpenStudy (lgbasallote):

right and the slant height is 11 so \[\huge LSA = \frac{(12)(11)}{2}\] solve that now

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