Since both triangles are similar we can write a proportion:
for example:
10 ft /8 ft
We are looking at the bigger triangle setting this proportion:
Hypotenuse/ adjacent side.
So for the smaller triangle, it will be:
x/60 inches
Where x is the missing side.
So:
10/8=x/60
But first, we have to convert the ft into inches.
Since :
1 ft = 12 inches
10 ft = 10x12 = 120 inches
8 ft = 8 x12 = 96 inches
Back with the proportion:
120/96 = x/60
10/8 =x/60
(10/8)60 =x
So, option 1 is correct.