How Do You Find the Width of a Rectangle if You Know its Length and Perimeter?

Note:

Trying to figure out a missing side length of a rectangle? Got the perimeter and the other side length? Then you can use that information and the formula for the perimeter of a rectangle to find that missing length! This tutorial will show you how!

Keywords:

known length
known perimeter
solve width
rectangle
width unknown
unknown width
perimeter
rectangle perimeter

Background Tutorials

Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.
- How Do You Find the Perimeter of a Shape?
  
  Ever had someone come up to you on the street, hand you a shape, and ask you to find the perimeter of that shape? Watch this tutorial, and next time that happens you'll be ready!
Evaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations).
- How Do You Evaluate an Algebraic Expression?
  
  Plugging variables into an expression is essential for solving many algebra problems. See how to plug in variable values by watching this tutorial.
- What is a Variable?
  
  You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!
- What's the Order of Operations?
  
  Check out this tutorial where you'll see exactly what order you need to follow when you simplify expressions. You'll also see what happens when you don't follow these rules, and you'll find out why order of operations is so important!