SQUARE be \[9{{x}^{2}}\] and \[{{x}^{2}}\] respectively. Then the sides of them will be \[\SQRT{9{{x}^{2}}}\]and\[\sqrt{{{x}^{2}}}\]i.e,\[3x\]and\[x\]respectively. Hence, the RATIO of their perimeter \[=\frac{4\times 3x}{4\times x}=3:1\]