What Is The Radius, Diameter, Circumference, And The Area Of The Image Of An Original Circle Using A Size Factor Of 50%?

If by "size factor of 50%" you mean reducing the size by 50% then these would be the results: The radius and diameter would be 1/2 of what they were originally but the area would decrease at the rate of:
(Pi•r₁²)-(Pi•r₂²)

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