12 is divisible by 3 and 4
You can define each side of a triangle as A B and C, and define the other triangle as triangle DEF. You can then say that A=D, B=E, AND C=F.
We can do this from finding 2/3, and that equals 0.66_7 and 7/12 is 0.5833_ and we divide the whole thing. 41.66 and 4.5833 and we get 11
