Percent reduction in area of the geometric shape is the reduction in area as per original area.

Mathematically, percentage reduction can be expressed as;

\(Percent.Reduction in Area=frac{Decrease.In.Area}{Original.Area}times 100\)[Percentage.Reduction.In.Area=frac{ΔA}{A}times 100]

\(Percent.Reduction.In.Area=frac{Original.Area-Final.Area}{Original.Area}times 100\)