[tex]\sqrt{\cfrac{16}{49}}\implies \cfrac{\sqrt{16}}{\sqrt{49}}\implies \cfrac{\sqrt{4^2}}{\sqrt{7^2}}\implies \cfrac{4}{7}[/tex]
hmmm 4/7 looks like a "ration" or fraction that is, so, if it moves like a ration and dances like a ration and runs like a ration, it ain't no duck, it must be a rational then.
