And we want to know, what is the perimeter of ABCD? So let me write it down. The perimeter of rectangle ABCD is just going to be equal to the sum of the lengths of the sides.

Round them up.

And I'll do perimeter here on the left, and I'll do area here on the right. And you're probably pretty familiar with these concepts, but we'll revisit it just in case you are not.

This is also going to be 2w over here.

And we know that AB is equal to 7, and we know that BC is equal to 5.

Let's do a couple more of these.

Environmental viscosity

Let's say I have another circle here.

McGee, David... Perimeter.

You come with me. McGee, take the perimeter.

Well one way to realize it is that the pier , the perimeter's the distance all the way around the rectangle.

So all we're interested in here is comparing the temperature of the beetle against the background.

Area and Perimeter

Each iceberg has its own individual personality.

28 meters.

So this right here, this is just a formula for the perimeter of a rectangle.

Anyway, we're done.

So it's equal to 28 centimeters square or squared centimeters.

We'll secure the perimeter.

Clear the area.

The pond was encircled with trees.

So let me draw a square here. My best attempt. So this is A, B, C, D. And we're going to tell ourselves that this right here is a square.

If AB is x, then BC is x, then DC is x, and AD is x. All of the sides are congruent. All of these segments are congruent.

No! Right and might are on our side.

Watch your spacing.

In an infinite expanse of nothingness...

We have to figure out its length as well. So, how do we figure that out?

Perimeter

And the Italian Alders are a very good example.

The lake is ten miles about.

Remember, a seamount turns into an island when it hits the surface. And what's the context of the Phoenix Islands?

I photographed this thing last week in Dorset.

Bar the gate. And set a watch on the surround.

Always mind your surroundings.

Fringing on your territory?

This tree measures three meters around.

No sign of the enemy in our surroundings.

And of course, the major thing

They are labor intensive and inefficient.

Well, it's going to be w w 2w 2w let me write this down

Have you locked down the area?

Primary exit blocked. Secondary, move.

What I want to do in this video is a fairly straightforward primer on perimeter and area.

But I had to make a little barrier, going around it, out of cellophane, to stop it moving.

Tall pine trees make a ring around the lake.