If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Geometry (all content)

### Course: Geometry (all content)>Unit 7

Lesson 1: Count unit squares to find area

# Measuring rectangles with different unit squares

Sal finds area of a rectangle with different sized units. Created by Sal Khan.

## Want to join the conversation?

• at what is a furgle
• A furgle is a made-up unit of measurement.

1 furgle = 2 feet

At , Sal comments that "one furgle" is something that he made up just for this video, so that we can practice measuring identical rectangles with two different units: feet & furgles.
• So, can you just use all six of the mini units that are 1 square foot and make a big square and do it the same for the other side? It will have the same amount of space, but different areas. Can we do that if it is possible?
• yes you can ,but both will have the same area because it has the same amount of space the only difference is that they will be measured in different square units
for example the measure of a square, measured in mm will be the same as measure in cm just that there will be a difference in number because u r using 2 different units but when u convert the answer u get in cm to mm the area will be the same
hope this helped
• What is a "voot" as used in the video at @ seconds?
• same questin
• A rectangle has an area of 18"and the height of the rectangle is 6 inches what is the length of the rectangle
• Remember that the area of a rectangle is its length x its height. So, we know the formula is (l x h = a).

Let's plug in our known values: (l x 6 = 18)

Let's rearrange to isolate the variable: (18 / 6 = l)

Let's solve for the length: (l = 3)

So, the length of the rectangle is 3 inches. It's simple algebra! Let me know if you have further questions.
• how does area help the real world
• It helps in panting spaces in a lot or planting seeds,and placing tiles in your house.
• At what is a feet? And why does it sound weird?
• It sounds weird because Sal is actually saying 'veet' and not 'feet.' Presumably 'veet' is the plural form of 'voot.' Sal is comparing feet and veet (a fictional unit) to show how we can use different units of area to measure the same object, but we have to take into account that the units are not of equal size.
• What is a furgle
• A furgle is a made-up unit of measurement.

1 furgle = 2 feet

At , Sal comments that "one furgle" is something that he made up just for this video, so that we can practice measuring identical rectangles with two different units: feet & furgles.
• This is so easy for me because i can just type this
So we've got two figures right over here, and I want to think about how much space they take up on your screen. And this idea of how much space something takes up on a surface, this idea is area. So right when you look at it, it looks pretty clear that this purple figure takes up more space on my screen than this blue figure. But how do we actually measure it? How do we actually know how much more area this purple figure takes up than this blue one? Well, one way to do it would be to define a unit amount of area. So, for example, I could create a square right over here, and this square, whatever units we're using, we could say it's a one unit. So if its width right over here is one unit and its height right over here is one unit, we could call this a unit square. And so one way to measure the area of these figures is to figure out how many unit squares I could cover this thing with without overlapping and while staying in the boundaries. So let's try to do that. Let's try to cover each of these with unit squares, and essentially we'll have a measure of area. So I'll start with this blue one. So we could put 1, 2, 3, 3, 4, 5, five unit squares. Let me write this down. So we got 1, 2, 3, 4, 5 unit squares, and I could draw the boundary between those unit squares a little bit clearer. So we have 5 unit squares. And so we could say that this figure right over here has an area. The area is 5. We could say 5 unit squares. The more typical way of saying it is that you have 5 square units. That's the area over here. Now, let's do the same thing with this purple figure. So with the purple figure, I could put 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 of these unit squares. I can cover it. They're not overlapping, or I'm trying pretty close to not make them overlap. You see, you can fit 10 of them. And let me draw the boundary between them, so you can see a little bit clearer. So that's the boundary between my unit squares. So I think-- there you go. And we can count them. We have 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. So we could say the area here-- and let me actually divide these with the black boundary, too. It makes it a little bit clearer than that blue. So the area here for the purple figure, we could say, so the area here is equal to 10. 10 square, 10 square units. So what we have here, we have an idea of how much space does something take up on a surface. And you could eyeball it, and say, hey, this takes up more space. But now we've come up with a way of measuring it. We can define a unit square. Here it's a 1 unit by 1 unit. In the future we'll see that it could be a unit centimeter. It could be a 1 centimeter by 1 centimeter squared. It could be a 1 meter by 1 meter squared. It could be a 1 foot by 1 foot square, but then we can use that to actually measure the area of things. This thing has an area of 5 square units. This thing has an area of 10 square units. So this one we can actually say has twice the area. The purple figure had twice the area-- it's 10 square units-- as the blue figure. It takes up twice the amount of space on the screen.

Plz give me 50+ votes then i will give you a lot of votes
• ws wwwiweiweiweiiiiiiiiiisw swn swnwsnnsw n swn wsn sw nwsn wns n wsn swn wsnwnwsnjwnjswjwnjwnssw sw nsw ws ws ws
ws ws ws
ws w w sw
w s sw
sw

ws sw ws ws sw ws sw ws wsiiiwieieieiewiewieiwiweiewiewiewieiiewiweiweiewiewiweiweiewiewiweiweiewiewiewiwiewiewiewiewiewiewiewiewiewiewiewiweiewiweiewiewieiewiewiewiewiwiiediidsididsidiidsiidiiwieieieiewiewiewiewiewiweiewiewiiwei like please
(1 vote)
• it was last talking about area. area is the space in a shape it takes up.