If every side length is multiplied by a factor $k$, the area is multiplied by $k^2$.

That square relationship is why a modest change in length can create a much larger change in surface coverage.

Starting from $50$ square units with scale factor $1.5$, the new area is $50 imes 1.5^2 = 112.5$.

Use this when resizing plans, diagrams, or geometry models.