1 acre = 4046,85642 square meters

So :

100 acres = 404685,642 sqm

Assuming that the two given sides of 100 meters are opposite sides, we have to find x for which :

100 m * x m = 404685,642 sqm

Or :

x = 404685,642 / 100 = 4046,85642

We've now got all 4 sides of the rectangle : 2 sides are 100 m, and 2 sides are 4046.85642 m. For the perimeter, we just add those :

perimeter = (2 * 100) + (2 * 4046,85642) = 8293,71284

So, the rectangle has a perimeter of 8293,71284 meters.

If something in the above explanation is not clear, then please ask about it !!

So :

100 acres = 404685,642 sqm

Assuming that the two given sides of 100 meters are opposite sides, we have to find x for which :

100 m * x m = 404685,642 sqm

Or :

x = 404685,642 / 100 = 4046,85642

We've now got all 4 sides of the rectangle : 2 sides are 100 m, and 2 sides are 4046.85642 m. For the perimeter, we just add those :

perimeter = (2 * 100) + (2 * 4046,85642) = 8293,71284

So, the rectangle has a perimeter of 8293,71284 meters.

If something in the above explanation is not clear, then please ask about it !!