The length of one side of the rectangle is 5cm, and its area is 30cm square. Find the perimeter of the rectangle?

For a rectangle, formulas for calculating the area and perimeter are known. S = a * b, P = 2 * a + 2 * b. In our case, a = 5 cm, b -? First, let’s determine the length of the second side:

b = S: a
b = 30: 5 = 6 cm

Now we substitute this value b we found and the known number a into the perimeter formula:

P = 2 * 5 + 2 * 6 = 22 cm

Answer: 22 cm is the perimeter.