The perimeter of the rectangle is 53cm, its length is 10cm9mm. Find the difference between length and width.

A rectangle is a rectangle with equal opposite sides.

Its perimeter is determined by the formula:

P = 2a + 2b

First of all, we express the width from this formula and find its value if P = 53 cm, and length = 10 cm 9 mm:

10.9 * 2 + 2b = 53,

21.8 + 2b = 53. Leave the unknown on the left side of the equation, and transfer the number to the right, changing the sign in front of it to the opposite:

2b = 53 – 21.8 = 31.2. To find the second factor, divide the product by the first:

b = 31.2: 2 = 15.6 cm.

The difference between length and width is:

15.6 cm – 10.9 cm = 4.7 cm.