The area of the rectangle is 20 cm. The width of this rectangle is 4 cm. Find its perimeter.
| January 8, 2021 | education
The area of a rectangle is equal to the product of its length and width. S = a * b. Knowing the width of the rectangle and its area, we find the length by dividing the area of the rectangle by its width.
20: 4 = 5 (cm).
The perimeter of a rectangle is equal to the sum of the lengths of its four sides. P = 2 (a + b).
2 (4 + 5) = 2 * 9 = 18 (cm).
Answer. 18 cm.
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