The length of one side of the rectangle is 7 cm, and its area is 70 cm2. Calculate the perimeter of this rectangle.

The area of a rectangle is equal to the product of the lengths of its sides. Therefore, if the area of the rectangle is divided by the length of one of its sides (a), we get the length of its second side (b):
70: 7 = 10 (cm).
Let’s define the perimeter of the rectangle:
P = a + a + b + b = 2a + 2b = 2 ∙ 7 + 2 ∙ 10 = 14 + 20 = 34 (cm).
Answer: P = 34 cm.

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