What scale should be used to map a 20 hectare plot of arable land in the form of a rectangle measuring 50 cm and 40 cm?

Let us determine the area of the rectangle that was given to us for making a map of a plot of arable land, knowing that the area, by definition, is equal to the product of the length of the rectangle by its width:
50 * 40 = 2000.
Let’s translate 20 hectares into cm2, knowing that 1 hectare is 10,000 m2, and 1 m2 is 10,000 cm2:
20 * 10000 * 10000 = 2,000,000,000.
Let’s determine what scale we need to choose in order to make a map of a plot of arable land:
2,000,000,000 / 2,000 = 1,000,000.
Answer: The scale for the map will be 1: 1,000,000.