Now that we've talked about Sr. units, we can apply them to other areas. For a classroom, for instance, we're going to say here that we can take the SI units from up above and relate them to perimeter, area, and volume. First, let's take a look at perimeter. Perimeter can be thought of as this distance around an object. When it comes to a classroom lecture hall, all we have to do is add up all the sides of the object or figure, or in this case the room to determine its perimeter.
So if we take a look here, our typical classroom is 15 meters by 10 meters. To find the perimeter we just add up all the sides. So that'd be 15 meters plus 10 meters plus 15 meters plus 10 meters. When we add them all up together, the perimeter of the classroom is 50 meters. Next, we can look at the area of the classroom. Area can be thought of as measured surface of an object as length squared. Now it's not actually just length squared. The formal formula for area is area equals length times width.
So that same classroom. Now if we look at it in terms of feet, we could say here let's say that we re-examined it in terms of feet and we found these new measurements and let's say that the lengths were 48 feet and the widths were 32 feet. So we would take 48 feet times the 32 feet and that will give us our area. When we multiply those two together that give me 1536. And we're going to say here that if we're multiplying feet times feet, that would come out to be feet squared. Here we're not worrying too much about any greater detail. Our area here for the classroom would be 1536 feet.
Finally, we could talk about the volume of an object. If we're looking at volume, volume can be thought of as the space occupied by a 3D object as length cubed. Now, in actuality, the real formula is volume, which is V equals length times width times the height of the object. So here we have an example of a cube. We'd say here that its length is these 15 meters, its width is 10 meters, and its height is also 10 meters. So multiplying these together, 15 meters times 10 meters times another 10 meters, so we multiply that all together. That's going to give me 1500. And since it's meters times meters times meters, that becomes meters cubed.
Now notice for our area and our volume, we talked about length squared and here we have feet squared and here we talked about length cubed and here we got meters cubed. Taking the SI units that we examined up above again can be used in a lot of different ways. Here we're using it to determine the perimeter, area, and volume of different objects. Now that we've looked at this example, move on to the practice question on the bottom of the page.