No. A ratio is calculated using division but they are not the same thing.
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Ratio
Division
The comparison of two numbers by division is called a ratio. For example, the fraction 3 over 2 can also be expressed as a 3 to 2 ratio.
Division is used to simplify the ratio (reduce it, put it into simplest terms). This gives you a direct (and usually small) perspective of the ratio, so can visualize it easier and understand it better.
The ratio of all lengths is the same. The ratio of the circumferences = ratio of the radii = 2:3