The width of the rectangle is 5 cm and the length is unknown, the perimeter is 38, how to find the length.

In order to find the length of a rectangle, you need to know the formula for calculating the perimeter of a rectangle.

Perimeter formula P = (a + b) * 2, where a – length, b – width, p – perimeter.

Substituting the data we have into the equation, we get

38 = (a + 5) * 2, solve the equation, open the brackets

38 = 2a + 10, move 10, to the other part of the equation, changing the sign

2a = 38 – 10

2a = 28, divide by 2

a = 14

Answer rectangle length 14 cm