Question

how do I find area of a square if I know the perimeter ?

Answer 1

If it's a square, then all sides are equal length so the length of one side s=P/4 where P is perimeter.

Once you have the side length s, then the area is just \[s ^{2}\]

Answer 2

if the perimeter is 196 will 14 be the area ? @DebbieG

Answer 3

No, how did you get that?

If P=196, then side length is 1/4 of that:\[s=\frac{ P }{ 4 }=\frac{ 196 }{ 4 }=49\]
From side length you should be able to get area.