The width of the rectangle is 3cm. What is the length if the perimeter is 16cm?

Before starting to solve this problem, let’s remember what the perimeter of the rectangle is. This is a sum of all its lengths, and these are two widths and two lengths of a rectangle. Thus, if we know the perimeter of the rectangle and its width, we can easily find out its length. To do this, you must perform the following action:

16 – (3 + 3) = 10 cm – the sum of two lengths.

In order to find out the length of one side of it, you need

10 ÷ 2 = 5 cm.

Thus, the length of the rectangle is 5 cm.