# Find the perimeter of the rectangle if its width is 8dm and the area is 72dm.

January 13, 2021 | education

| First of all, we express the length of the rectangle from the formula to determine its area. We know that S = a * b. To find the first factor, divide the product by the second:

a = S: b.

According to the condition of the assignment, S = 72 dm², b = 8 dm.

Therefore, a = 72: 8 = 9 dm.

The perimeter is the sum of all sides, for such a figure it corresponds to the formula:

P = 2a + 2b = 2 * 9 + 2 * 8 = 18 + 16 = 34 dm.

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