Equal means they're the same thing. However, proportional means that they have the same rate of change. For example, a rectangle that is 4x8 is proportional to one that is 12x24 because the rate of change is 3 for both measurements.
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A linear scale is a scale with equal divisions for equal vales, for example a ruler. A non linear scale is where the relationship between the variables is not directly proportional.
Congruent means exactly the same. Proportional means that it's similar.
the difference between two equal fractions is zero.
No difference.
Zero.