The area of the rectangle is 24 mm 2, its width is 4 mm. Find the perimeter of this rectangle.

In order to find the perimeter of a rectangle, you need to know the lengths of all its sides.

Since the opposite sides of such a figure are equal, its area is calculated by the formula:

S = a * b. If its value is 24 mm², and the width is 4 mm, we find the length:

a = S: b = 24: 4 = 6 mm.

The sum of all sides (perimeter) is determined by the formula:

P = 2a + 2b = 2 * 4 + 2 * 6 = 8 + 12 = 20 mm.