The area of the rectangle is 42 cm. Find the width of the rectangle if its length is 7 cm. Find the perimeter of the rectangle.

The area of a rectangle is calculated as the product of its length and width. S = a * b
To find the width of a rectangle, divide the area by its length:
1) 42cm2: 7cm = 6cm rectangle width.
We calculate the perimeter of this rectangle by the formula the sum of its length and width multiplied by two.
P = 2 * (a + b)
2) 2 * (7cm + 6cm) = 2 * 13cm = 26cm perimeter of the rectangle.
Answer: the width of the rectangle is 6 cm, the perimeter of the rectangle is 26 cm.