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For $\triangle ABC$, all its side lengths are integers. The perimeter of $\triangle ABC$ with a side of length $25$ and a side length of $18$ is at least ． 
Overseas Competition->Knowledge Point->Calculation Modules->Basic Concepts of Equation->Inequalities
We know from the triangle inequality that the last side, $s$, fulfills $s+18\textgreater25$. Therefore, $P\textgreater25+25$. The least integer value of $P$ is $51$ 