Answer:
66
Explanation:
In the triangles, you can see a shape being bolded (Ex: In the first triangle, 13, 9, and 117 are corresponding to the bolded triangle) The two smallest numbers in that triangle are multiplied to get the largest number (Ex. 13*9=117). This could also work for the other triangles, like 8*3=24, 8*12=96, and so on.
For the missing edge, the two numbers are 11 and 6. We have to find what the product of 11 and 6 is, which is 66.