![]() Scroll over to the right a little bit- plus 4 plus 6. Where gnu is a completely made-up unit of length Is 5 times 2 gnus, which is equal to 10 gnus, So the perimeter here, we couldĪdd 2 repeatedly five times. Of this pentagon in gnus? Well, it's 2 plus 2 plusĢ plus 2 plus 2 gnus. That's a new unit ofĭistance that I've just invented- 2 gnus. Of these sides are 2- and I'll make up a unit here. Now, what about this pentagon? Let's say that each These are all in meters, these are all in meters, then This rectangle going to be? What is the distanceĪround the rectangle that bounds this area? Well, it's going toĮqual to- let's see, that's 3 plus 3 is 6, So let's say this is 3 meters,Īnd this is also 3 meters. These distances, let's say they're in meters. To now pause the video and figure out the parameters Plus 4 feet plus 4 feet is equal to 12 feet. If this is 4 feet,Ĥ feet and 4 feet, then it would be 4 feet So what's its perimeter? Well, here, all theįor this triangle is going to be 4 plus 4 plusĤ, and whatever units this is. Go around the boundary to essentially go completelyĪround the figure, completely go around the area? So let's look at this first They're talking about the boundary of some area. So this figure has a perimeter of 19 in whatever units these distances are actually given. So what is this going to be equal to? 1 plus 4 is 5, plus 2 is 7, plus 2 is 9, plus 4 is 13, plus 6 is 19. And here the perimeter will be 1 plus 4 plus 2 plus 2- let me scroll over to the right a little bit- plus 4 plus 6. I'll just assume that this is some generic units. How would you figure out its perimeter? Well, you just add up the lengths of its sides. Here we have a more irregular polygon, but same exact idea. Or you could just say this is 5 times 2 gnus, which is equal to 10 gnus, where gnu is a completely made-up unit of length that I just made up. So the perimeter here, we could add 2 repeatedly five times. Or we're essentially taking 1, 2, 3, 4, 5 sides. So what is the perimeter of this pentagon in gnus? Well, it's 2 plus 2 plus 2 plus 2 plus 2 gnus. That's a new unit of distance that I've just invented- 2 gnus. ![]() Now, what about this pentagon? Let's say that each of these sides are 2- and I'll make up a unit here. And if we're saying these are all in meters, these are all in meters, then it's going to be 16 meters. So what is the perimeter of this rectangle going to be? What is the distance around the rectangle that bounds this area? Well, it's going to be 3 plus 5 plus 3 plus 5, which is equal to- let's see, that's 3 plus 3 is 6, plus 5 plus 5 is 10. This is a rectangle here, so this is 5 meters. So let's say this is 3 meters, and this is also 3 meters. So let's say that these distances, let's say they're in meters. We would just add the lengths of the sides. Now, I encourage you to now pause the video and figure out the parameters of these three figures. If this is 4 feet, 4 feet and 4 feet, then it would be 4 feet plus 4 feet plus 4 feet is equal to 12 feet. So what's its perimeter? Well, here, all the sides are the same, so the perimeter for this triangle is going to be 4 plus 4 plus 4, and whatever units this is. How far do you have to go around the boundary to essentially go completely around the figure, completely go around the area? So let's look at this first triangle right over here. ![]() We're actually talking about the length of the boundary. But now we're not just talking about the boundary. And when we talk about perimeter in math, we're talking about a related idea. When people use the word "perimeter" in everyday language, they're talking about the boundary of some area. ![]()
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