Classifying three dimensional shapes

0:00- [Narrator] We're told to match each figure to its classification. And there's a bunch of classifications here. They have cylinder, cone, sphere, prism, pyramid, and then they have these shapes and we can actually drag these around. So we wanna match the right one to the right one.

0:15So first of all, let's just think about what each of these words or these classifications mean. What's a cylinder? Well, when I think of a cylinder, I think of something like a can, like a can of soup or a soda can. And a cylinder is a solid shape with two flat, round bases that are the same side and one curved side.

0:37So what looks like that? Well, this has only one base and it's definitely not round. So this is not a cylinder. Now this one here looks pretty good, that has two round bases and it's curved, the side that connects them is curved all the way around. This looks a lot like a can or a drum.

0:57So I like this one as a cylinder. Okay, now the next one is a cone, what's a cone? Well, you might be familiar with ice cream cones. And that's a pretty good description of what a cone looks like. It's a solid shape, although an ice cream cone doesn't necessarily have a top to it 'cause you need to put the ice cream on.

1:14But when we're talking in geometry terms, a cone is a solid shape with one flat circular base. You could view that as the top of the cone if it was filled in and a vertex at the other end. So which one here looks like a cone or maybe a party hat? Well, this is it, a circular base right over there.

1:31Let me take it all the way to the top. I like that one for cone. Now, sphere, what is that? A sphere, I think of a ball when I think of a sphere, something that's completely round, has no flat sides, edges or corners. So which one is a sphere? Well, this is a sphere, that looks like a ball or a globe.

1:52And then last but not least, what's a prism? Sometimes you might have heard of prisms in terms of something that you put light through it and it might shine a rainbow. But a prism, when we're talking about geometry is a solid shape with flat sides, two bases that are the same shape and size and the sides are rectangles.

2:12So what are we looking at in this case? Well, you have two bases and the sides are rectangles. This has one base, and the sides are not rectangles, they're triangles. This one has two bases and the sides are rectangles. So I like that as prism. And then last but not least, this looks pretty good for pyramid.

2:32We can think of the pyramids in Egypt, but what's a definition for pyramid in a geometric sense? Well, it's a solid shape with one flat base, which we see right over there. And triangular sides that come to a point at the top. Well, I like this one right over here.

2:50Now this one, the base is a square. But you could have a base that's a triangle or you can have a base that's a Pentagon. You could have multiple sides on that base. But this one right over here is definitely a pyramid. But even if it wasn't a rectangle or a square at the base, any other shape, it would still be a pyramid.