One side of the rectangle is 7 dm, and its perimeter is 23 dm 4 cm. We calculated the area of the rectangle.

1. Find the length of the second side of the rectangle. For convenience, let’s express the length in centimeters. Let the unknown side of the rectangle be x cm, then the second side is 70 cm, the perimeter is 234 cm.Let’s make the equation:

(x + 70) x 2 = 234.

2x + 140 = 234.

2x = 234 – 140.

2x = 94.

x = 94: 2.

x = 47 (cm).

2. Now we know that the sides of the rectangle are 70 cm and 47 cm. The area of the rectangle is equal to the product of its two sides:

70 x 47 = 3290 sq. Cm. = 329 sq.dm

Answer: the area of the rectangle is 329 sq. Dm.