Question

What’s the missing leg?!

Answer 1

13.416ft or,

13.42ft rounded up

Explanation:

`c^2=a^2+b^2\\=6^2+12^2\\=36+144\\=180\\=√(180)\\ =13.416ft`

Answer 2

Do you mean the length of the cable?

If so, it would be 13.42ft.

Take the cable as the hypotenuse, and add the squares of 12 and 6 then squareroot them.