The area of the land plot is shown on the plan, the scale of which is 1: 250, in the form of a rectangle

The area of the land plot is shown on the plan, the scale of which is 1: 250, in the form of a rectangle with an area of 128 cm2. Find the actual area of this parcel.

Since the scale indicates how the distances on the map relate to each other on the terrain, the ratio of the areas will be proportional to the square of the scale:
250 * 250 = 62500
The required area is equal to:
12800 mm ^ 2 * 62500 = 800000000 mm ^ 2 = 800 m ^ 2.