Find the width of the rectangle at the perimeter is 85.4 cm and the length is 22.3 cm.

The perimeter of a rectangle is calculated as the sum of its length and width multiplied by two.
In order to find the width, the first step is to calculate the semi-perimeter of the rectangle:
1) 85.4 cm: 2 = 42.7 cm semi-perimeter of a rectangle.
Now let’s calculate what the width of the rectangle is:
2) 42.7 cm – 22.3 cm = 20.4 cm rectangle width.
Answer: The width of the rectangle is 20.4 cm.