Answer: He have traveled 9.2 miles towards the north.
Explanation:
Since we have given that
Distance between mason from home = 11 miles
Distance he traveled due west = 6 miles
We need to find the distance he traveled due north .
since it forms right angled triangle.
So, by applying "Pythagorus theorem", we get that

Hence, he have traveled 9.2 miles towards the north.