The length of the rectangle is 1 m 25 cm, and the width is 3 dm 5 cm. What is the perimeter of the rectangle.

As you know, the perimeter of a rectangle can be found by the sum of its four sides or the sum of its length and width multiplied by 2:

p = 2 * (a + b).

Let’s express the length and width of the rectangle in the same units – in decimeters. There are 10 decimeters in one meter:

1 m 25 cm = 12 dm 5 cm = 12.5 dm;

3 dm 5 cm = 3.5 dm.

Now let’s find the perimeter of the rectangle:

p = 2 * (12.5 + 3.5) = 32 dm.

Answer: the perimeter of the rectangle is 32 dm or 3 m 20 cm.