Question

Find the ratio of the surface areas of the solids.

Answer 1

First find the surface area of each figure. Do you know how?

Answer 2

is it 2(wl+hl+hw)

Answer 3

Exactly that!

Answer 4

Now use it to find the surface area of each.

Answer 5

ok so for the smaller one would it be 2(2*2+4*2+4*2)

Answer 6

Yup.

Answer 7

40 is the SA of the smaller one and the larger one is 90

Answer 8

Correct!

Answer 9

You do NOT need to know the Surface Area in order to answer the question.

Linear Measure -- 2:3
Surface Area -- 2^2:3^2 ==> 4:9
Volume -- 2^3:3^3 ==> 8:27

Answer 10

^@tkhunny is right. I totally forgot about that short cut.

Answer 11

It's a thing. It's not a shortcut. :-)

Answer 12

Haha okay :)

Answer 13

i dont really understand it but thanks to both of you

Answer 14

Just notice that your calculated 40:90 is the same ratio as my Area 4:9. Unique answers don't care how you find them.

Answer 15

true thank you!