Find using the equation the length of the side of this square.
We denote by x the length of the side of this square.
In the condition of the problem it is said that the side of the square is 2 2/5 m less than its perimeter, which is 2.4 m, therefore, we can draw up the following equation:
4x = x + 2.4.
We solve the resulting equation the length of the side of this square:
4x – x = 2.4;
3x = 2.4;
x = 2.4 / 3;
x = 0.8 m.
Knowing what the length of the side of a given square is equal to, we find its area:
0.8 * 0.8 = 0.64 m ^ 2.
Answer: the length of the side of this square is 0.64 m ^ 2.
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