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it is a scale that goes from loudest to quietestegLOUDESTaroplanewhaletrafficwhisperingQUIETEST
It is usually a fraction, as it is usually shown in a ratio. Decimal and percentages can be used though.
Tautologically!
Scale factor and perimeter are related because if the scale factor is 2, then the perimeter will be doubled. So whatever the scale factor is, that is how many times the perimeter will be enlarged.
The areas are related by the square of the scale factor.