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## MAP Recommended Practice

### Course: MAP Recommended Practice>Unit 23

Lesson 2: Measuring length

# Measuring lengths (cm, m)

Sal measures objects with a ruler.

## Want to join the conversation?

• what does dimension mean
• Dimension in math can be expressed in three dimensions. It is the way a figure is represented and measured. The first dimension is a one dimensional line, (1D) which only has length and height. The second is a two dimensional plane (2D), which has height, length, but area. An example of this would be a shape like a square. Finally, a three dimensional figure (3D) has length, height, and depth, and surface area. Think of a three dimensional figure as an object that looks like you can hold it. Examples of three dimensional objects are cubes, spheres, and much more.
• is measureing your backyard in meters unusual?
• It depends! If you live in America, Liberia, or Myanmar, you are more likely to measure it in feet or yards. However, people in other countries measure things in meters.
• Lets say something had a negative length. What would that mean? Or maybe, what would that look like?
• I don't believe that a negative length is possible. It's a little hard to explain. Length is how long something is, so you can only work with positive numbers, because you sort of "count" how long something is, like how many inches long. When you count you have to start at 0, and move up from there. If it were possible, I have no idea what it would look like. I guess that's something to think about :) It's a difficult concept to understand, but I hope I helped a little bit.
• Can it be like one side is inches and one side is a foot?
• Yes. For example, say that one side of a triangle is 24 inches, another side is 2ft and the last side is 1 foot. Then, turn 24 inches into feet. There are 12 inches in one foot, so 24 inches is 2ft. Therefore, the sides of the triangle are equal to 2ft, 2ft, and 1 foot