Question

A cube has a surface area of 72 in2.



Find the surface area of a scaled image with a scale factor of 1.5.



in2

Answer 1

@jigglypuff314

Answer 2

SA = 6a^2

Plug in 72 for the Surface Area and solve for the side length 'a'

Answer 3

72 = 6a^2

Divide 6 to both sides, then find the square root of both sides.

Answer 4

same idea as before :)

surface area is in^2
each side is just in
scale factor of 1.5 on each side
means a (1.5)^2 factor on the overall surface area

so (1.5)^2 = ?

then multiply that by 72 :)

Answer 5

i got 243, am i right?

Answer 6

No..

Answer 7

I got something else.

Answer 8

72 / 6 = ?

Answer 9

not quite @r_josh10 :)
try again?

Answer 10

@iGreen

Answer 11

12

Answer 12

Yes..and what's the square root of 12?

Answer 13

Hmm..I don't think that's the correct way to do it..xD

Answer 14

not quite!
(1.5)^2 = ?

Answer 15

162 is the answer.. sorry is that right

Answer 16

much better! :)
yes, that's waht I got :)

Answer 17

For some reason..I got 974..lol.

Answer 18

/bonk @iGreen that doesn't seem right xD
remember that it is asking for surface area and not volume?

Answer 19

thanks again

Answer 20

sqrt 12 = 3.46410162

This is the side length..so we multiply it by a scale factor of 1.5

1.5 * 3.46410162 = 5.19615243

This is the side length of the new scaled cube..

SA = 6a^2

SA = 6(5.19615243)^2

SA = 6(27)

SA = 162

Oh..nevermind I did the wrong calculations :P

Answer 21

I did something wrong..my method was correct after all..

Answer 22

tah dah ;P
yes is was, but mine is much easier ;)

Answer 23

Yep

Answer 24

Didn't know we could do it that way..oh well :P

Answer 25

the method I've been using I had learn here on OpenStudy from @perl :D

Answer 26

MY LIFE HAS NEW MEANING xD

Answer 27

That's awesome! :D

Answer 28

"Whoever's the owner of the white sedan, you left your lights on!"