Explanation:
the length of the third side could be 6 
As in order to form a triangle The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
so Here 
8 + 3 > 6 
11 > 6 ( True) ✔
8+ 6 > 3 
14 > 3 ( True) ✔
6 + 3 > 8 
9 > 8 ( True) ✔
Hope it will help you :)