The length of one side of the rectangle is a cm, and the other is 8 dm. Make and write down an expression

| April 18, 2021 | education

The length of one side of the rectangle is a cm, and the other is 8 dm. Make and write down an expression to calculate its perimeter.

According to the condition of the problem, the length of one side of the rectangle is a cm, and the length of the second side of this rectangle is 8 dm.

Let’s express the length of the second side of this rectangle in centimeters.

There are 10 centimeters in one decimeter, therefore, in 8 decimeters, 8 * 10 = 80 centimeters and the length of the second side of this rectangle in centimeters is 80 cm.

Let’s write down what the perimeter of this rectangle is.

The perimeter of any rectangle is equal to the sum of the length and width of this rectangle multiplied by 2, therefore the perimeter P of this rectangle is:

P = 2 * (a + 80) = 2 * a + 2 * 80 = 2a + 160 cm.

Answer: the perimeter of this rectangle is 2a + 160 cm.



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