A rectangle-shaped plot adjoins the house, the length of which is 10 m

A rectangle-shaped plot adjoins the house, the length of which is 10 m. On three sides, the plot is surrounded by a fence 130 m long. What is the area of this plot.

Answer: 600 m2.
Since the site is rectangular, its opposite sides are equal to each other. This means that the side opposite to the side that is adjacent to the house is also 10m.
The other two sides of the site are:
130 – 10 = 120 (m).
These sides are also opposite to each other, which means they are equal, then the length of one of these sides will be: 120: 2 = 60 (m).
Let’s determine the area of this site:
60 * 10 = 600 (m2).