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What are 3D Shapes? - Definition & Examples

Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught Math at a public charter high school.

What's the difference between 2D and 3D shapes? Learn the answer to this question in this lesson. You will also explore what makes spheres and cubes 3D shapes.

Definition

What makes something 3D? Is it the way it looks? An easy way to think of a 3D shape is any shape or object that takes up air space. Think about your own body for a minute. Your body is a 3D shape. It is not a uniform shape like a building block, but it is a 3D shape, nonetheless. What makes your body a 3D shape? Does it take up air space? Of course it does; you can't be at the same spot as anyone else. You can't take up the same space as a chair or a dog or anything else. Only you can occupy your space. This is what makes a shape 3D.

A test you can do to check whether something is 3D or not is to try to place something in the exact spot where that shape is. Look around you for something you can grab. Take your pen, for instance. Place it on your desk. Now, try and take another pen and place it in the same exact spot as your first pen. Can you do it? No, you can't. The only way you can do it is if you moved your first pen to make room for the second.

Each pen takes up its own unique space.
pens

Even a flat piece of paper is a 3D shape in the world. Lay two pieces down, one on top of the other, and look at them. Are both sheets of paper taking up the same space? It may seem so at first, but look carefully. One is actually on top of the other because both take up space.

Two sheets of paper can be placed one on top of the other, but they cannot occupy the same space.
paper

In mathematical terms, a 3D shape has three dimensions. The 'D' in '3D' stands for 'dimensional.' In a world with three dimensions, you can travel forwards, backwards, right, left, and even up and down. The ability to travel up into space and back down differentiates 3D from 2D. The world you live in is all 3D. You can walk anywhere on land and you can fly anywhere in the air. Underwater, you can swim in all three dimensions.

Examples

In mathematics, you have your standard 3D shapes that you need to know. These are shapes such as cylinders, spheres, cubes, and pyramids. These are all examples of 3D shapes.

Example of a sphere, cube, and cylinder.
3D shapes

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