Answer:
Given, perimeter = 50 cm Perimeter of an isosceles triangle = sum of its all side \[\Rightarrow \] Perimeter \[=a+b+c\] \[\Rightarrow \] \[50=18+18+\text{ }Third\text{ }side\] \[\Rightarrow \] \[5036=\text{ }Third\text{ }side\] \[\Rightarrow \] Third side = 14 cm.
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