C{{m}^{2}}\] \[\THEREFORE \] SIDE \[=~5\,\,cm\] Perimeter of\[B=12\,\,cm\] \[\therefore \] Side \[=\frac{12}{4}=3\,\,cm\] \[\therefore \]Side of \[C=5+3=8\,\,cm\] \[\therefore \]Area \[={{(8\,\,cm)}^{2}}=64\,\,c{{m}^{2}}\] \[\therefore \]Perimeter\[=4\times 8\,\,cm=32\,\,cm\]