The rectangle is 56 cm long and 0.45 in width. Calculate the perimeter.

Let us calculate, by making a proportion, the width of the rectangle (denoting it as x), provided that it is 0.45 of the length equal to 56 cm (we will take it as 1 whole):

56 cm = 1.

x = 0.45.

Let’s write the equation, acting according to the “cross” rule and find the value of the variable:

x = 56 * 0.45: 1 = 25.2 cm.

The perimeter of such a figure is determined by the formula:

P = 2a + 2b = 2 * 56 + 2 * 25.2 = 112 + 50.4 = 162.4 cm.