The length and width of the rectangle are 10 and 4, respectively. Find the measurements

The length and width of the rectangle are 10 and 4, respectively. Find the measurements of a rectangle if its perimeter is 56 cm.

Enter the proportionality coefficient x, then the sides of the rectangle are equal to 10x and 4x.
Let’s use the formula for the perimeter of a rectangle and write the equation:
2 * (10x + 4x) = 56
14x = 28
x = 2
Knowing the proportionality coefficient, we find the sides of the rectangle:
2 * 10 = 20 (cm) – length;
2 * 4 = 8 (cm) – width.
Answer: 20 cm and 8 cm length and width of the rectangle, respectively.