A rectangle and a square have the same perimeter. The side of the square is 14 cm.

A rectangle and a square have the same perimeter. The side of the square is 14 cm. The width of the rectangle is 7 cm. Find its length.

Given:
A rectangle and a square have the same perimeter.
The side of the square is 14 centimeters.
The width of the rectangle is 7 centimeters.

To find the perimeter, you need to find the sum of the lengths of all sides of the figure.
Find the perimeter of the square:
P = 14 + 14 + 14 + 14 = 56 centimeters – the same perimeter of the rectangle.
Let’s calculate the sum of the two lengths of the rectangle:
56 – 7 – 7 = 42 centimeters.
Let’s calculate one length of a quadrangle:
42: 2 = 21 centimeters.
Answer: The length of the rectangle is 21 centimeters.