Find the unknown sides and the perimeter of the rectangle, the length is unknown centimeters, the width is 7 cm.

Find the unknown sides and the perimeter of the rectangle, the length is unknown centimeters, the width is 7 cm. The area is 84 cm2, and the perimeter is unknown.

Find the length of the rectangle, for this you need to divide the area of the rectangle by its width:

84: 7 = 12 cm – the length of the rectangle;

Find the perimeter of the rectangle, for this you need to add all the sides of the rectangle:

7 + 7 + 12 + 12 = 38 cm – the perimeter of the rectangle.

Answer: 12 cm is the length of the rectangle; 38 cm is the perimeter of the rectangle.