The perimeter of the rectangle is 72cm, its length is 23cm. Find the area of the rectangle.

You can express the width of the rectangle from the formula to calculate its perimeter. Since the opposite sides of such a figure are equal, it corresponds to the formula:
P = 2a + 2b. By condition, the sum of all sides is 72 cm, length = 23 cm.
Let’s write the equation, substituting the known values:
2 * 23 + 2b = 72.
Variables are always shown on the left and known values on the right. When transferring, the sign in front of them changes to the opposite.
2b = 72 – 46 = 26.
To find the second factor, divide the product by the first:
b = 26: 2 = 13 cm.
Square:
S = a * b = 23 * 13 = 299 cm².