The area of the rectangle is 3800mm, and the length of one side is 50mm after subtracting the perimeter.

The area of the rectangle is 3800mm, and the length of one side is 50mm after subtracting the perimeter. write down the formula of the rectangle, substitute the number in the formula and find the unknown side of the rectangle, calculate the perimeter of the rectangle.

The opposite sides of a rectangle are equal, its area is calculated by the formula:

S = a * b. Let’s find the unknown side, provided that the area of this figure is 3800 mm², one side = 50 mm:

3800 = a * 50, therefore:

a = 3800: 50 = 76 mm.

Perimeter – the sum of all sides corresponds to the formula: P = 2a + 2b, we determine its value for this rectangle:

P = 2 * 50 + 2 * 76 = 100 + 152 = 252 mm.