Question

(Photo) Please help mee

The two solids below are similar, and the ratio between the lengths of their edges is 3:5. What is the ratio of their surface areas?

Answer 1

`\text {Ratio of surface area} = ( (3)/(5) )^2= (9)/(25)`

Answer: 9 : 25

Answer 2

Explanation:

Alright, lets get started.

The surface area of green solid is :

`2 (3*3 + 3*3 + 3*3) = 2*27=54`

The surface area of orange solid is :

`2(5*5 + 5*5 + 5*5) =2*75= 150`

So the ratios of their surface area will be :

`(54)/(150)`

`(18)/(50)`

`(9)/(25)`

Hence the answer is 9:25 : Answer Hope it will help :)