Find the perimeter if you know that one side of the rectangle is 8 dm 6cm and the other side is 5cm larger.

The perimeter of a rectangle is the sum of all the sides of the rectangle.


Let’s express the known side of the rectangle in cm:

8 dm 6 cm = 86 cm.

1) Find the second side of the rectangle:

86 + 5 = 91 (cm) – the second side of the rectangle.

2) Find the perimeter of the rectangle:

86 + 86 + 91 + 91 = 354 (cm) – the perimeter of the rectangle.

Let’s express the perimeter in dm and cm:

354 cm = 35 dm 4 cm.

Answer: the perimeter of the rectangle is 35 dm 4 cm.

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