Percent reduction in area of the geometric shape is the reduction in area as per original area.
Mathematically, percentage reduction can be expressed as;
[latex]Percent.Reduction in Area=frac{Decrease.In.Area}{Original.Area}times 100[/latex]
[Percentage.Reduction.In.Area=frac{ΔA}{A}times 100]
[latex]Percent.Reduction.In.Area=frac{Original.Area-Final.Area}{Original.Area}times 100[/latex]
