Question 197169
In order for a triangle to be "connected", the sum of any two sides must be greater than the length of the remaining side. If the third side is longer than the sum of the two other sides, the triangle could not exist.

So, look at the three given sides. Add two and see if the third is shorter. Do that for all three possible combinations. 

In this case, the lengths do not satisfy the requirement (16+18)=34, which is less than the 35.