Calculate the area of a square plot if its diagonal measures 20 meters.

Explanation

The area of a square is given by (side)^2. Since the diagonal (d) is 20 m, the side length (s) can be found using the formula d = s√2. Thus, s = 20 / √2 = 10√2 m. The area = s^2 = (10√2)^2 = 100 × 2 = 200 square meters.