Relationship between the Sides of a Triangle

In $△\mathrm{ABC}, \mathrm{O}$ is the point in the interior of the triangle, then $\mathrm{OA}+\mathrm{OB}>\mathrm{AB}$.

The difference between any two sides of a triangle is _____ than the third side. (greater/ smaller)

Two sides of a triangle are $4 \mathrm{cm}$ and $6 \mathrm{cm}$ long. The third side must be less than _____ $\mathrm{cm}$

If $\left|z\right|=4,$ then the minimum value of $|z+3+4i|$ is