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Geometry for Kids6 chapters | 45 lessons

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Lesson Transcript

Instructor:
*Nicole Huppenthal*

Nicole has taught at both the elementary and high school levels, specializing in gifted education, elementary education, and technology.

This lesson introduces you to a type of 3-dimensional figure: the cone. We'll learn to identify cones in everyday life, and we'll explore the specific attributes that make cones unique from other 3-dimensional shapes.

If you're like most kids, you know of a cone as the thing you put ice cream in, but it's so much more than just part of a tasty treat. A **cone** is a geometric shape that's 3-dimensional and has a circular base that narrows to a point at the other end. When we say that it's **3-dimensional**, we mean that it has length, width, and height. It's not a flat shape that you can draw on paper. Rather, it's something that you can pick up and hold in your hand.

As we can see in the image, a cone has only one **face** (or flat side, also called a base), and that face is circular. The sides of the cone are curved and roll up to a point at the top. When we talk about 3-dimensional shapes, we call this point a **vertex**.

The width of the cone is the distance across its circular base, which is called **diameter**, since we're working with a circle. The length is the same thing as the width. The height of the cone is the distance from the base to the vertex.

In order to see what really makes a cone different from other figures, we can compare properties. One difference to note is the number of faces each has. Unlike the rest of the figures that have several flat sides, cones only have one face. Cylinder faces, like cone faces, are circular. However, a cylinder has two faces, while a cone has only one.

Cones also only have one vertex, which looks similar to the vertex at the top of the pyramid (even though pyramids have other vertices at the base). These properties make the cone different than all of the other figures, because no other figure has precisely one face and one vertex.

These properties also help us to learn what the cone can do. Because a cone has at a flat face, we can slide a cone across a flat surface. And because the sides of the cone are curved, we know we can roll it (even though it may not get very far). One thing we can't do with cones is stack them, because it doesn't have two flat faces.

Look around you as you go about your day today. Where do you see real-life examples of cones?

As you're driving down the road, look for the orange traffic cones. You might even use cones like this during gym class or at recess when playing games. Are you going to a birthday party? Party hats are often in the shape of cones. And, of course, we can't forget about the cone that we use to hold out favorite cold treat - the ice cream cone!

**Cones** are a unique type of **3-dimensional** figure that have length, width, and height. A cone has a single flat **face** (also called its base) that's in the shape of a circle. The body of the cone has curved sides that lead up to a narrow point at the top that we call a **vertex**.

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7 in chapter 3 of the course:

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Geometry for Kids6 chapters | 45 lessons

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