The perimeter of a square plot is the same as that of a rectangular plot with sides 35 m and 15 m. The side of the square plot is:

25 m

We know that,

Perimeter of the square = 4(side)

Perimeter of the rectangle = 2 (l + b)

We have,

Sides of rectangular plot are = 35 m and 15 m

Then,

Perimeter of the rectangular plot = 2 (35 + 15) = 2 × 50 = 100 m

Here it is given that,

Perimeter of square plot = perimeter of rectangular plot

4(side) = 100

= side = 25 m