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Width: Definition and Example | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">WidthWidth: Definition and ExampleTable of ContentsDefinition of width

Width in mathematics refers to the horizontal measurement or distance measured from side to side. It is measured perpendicular (at right angles) to the length of an object. Width tells us how broad an object is and is often used to describe the shorter side of two-dimensional shapes like rectangles. Width can be measured using standard units such as meters, centimeters, and millimeters, or customary units like inches, yards, and feet.

The concept of width varies across different shapes. In two-dimensional shapes like rectangles, width typically refers to the shorter side (also known as breadth), while in a square, any side can be considered the width since all sides are equal. In three-dimensional shapes, width doesn't necessarily correspond to the shortest measurement—it depends on the orientation of the shape. Width differs from depth, which is used specifically for three-dimensional objects and refers to the dimension perpendicular to both length and width.

Examples of width Example 1: Finding the Width of a Rectangle Problem:

What is the width of a rectangle that has dimensions of 8 cm and 5 cm?

Step-by-step solution: First, recall that width is defined as the shorter side of a rectangle. Next, compare the two given dimensions: 8 cm and 5 cm. Then, identify which measurement is smaller: 5 cm Therefore, the width of the rectangle is 5 cm. Example 2: Determining Width Using a Grid Problem:

What is the width of a rectangle drawn on a grid where one side spans 4 units and the other spans 2 units?

Step-by-step solution: First, look at both dimensions of the rectangle on the grid. Next, remember that the width is the shorter measurement of a rectangle. Then, compare the two measurements: 4 units and 2 units. Since 2 units is less than 4 units, the width of the rectangle is 2 units. Check by confirming that this is indeed the side-to-side measurement when the rectangle is properly oriented. Example 3: Identifying the Width of a 3D Object Problem:

Give the width of a rectangular prism (cuboid) with dimensions 5 cm × 1 cm × 3 cm.

Step-by-step solution: First, understand that in a rectangular prism, the three dimensions are usually labeled as length, width, and height. Next, when given dimensions in the order of length × width × height, the second number represents the width. Alternatively, if the orientation isn't specified, the width is typically the intermediate dimension (not the longest or shortest). In this case, we have dimensions 5 cm, 1 cm, and 3 cm. If we follow the standard notation of length × width × height, the width would be 1 cm. However, if we need to identify width based on orientation, we would need more information about how the prism is positioned. Given the information provided, the width of the cuboid is 1 cm. Comments(8)RRugbyPlayerPennyNovember 6, 2025I've used this width definition to teach my students. It's clear and the examples really help them grasp the concept in different shapes!

TTechnicianQuinnNovember 4, 2025I've been struggling to explain width to my students. This definition and examples made it so much easier! Thanks for the great resource.

NNatureLover72September 17, 2025I’ve been using this page to explain width to my 3rd grader, and it’s been super helpful! The examples make it easy to connect it to real-life objects like books and tables. Great resource!

NNatureLover25September 10, 2025I’ve used this page to explain width to my kids during homework time, and it’s been a lifesaver! The examples made it super easy for them to understand. Thanks for breaking it down so well!

MCMs. CarterAugust 26, 2025I’ve used this definition to explain width to my kids during homework time. The examples really helped them see how width works for both shapes and objects. Great resource!

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