According to the Australian Curriculum Mathematics (Year 1, ACMMG022), recognize and sort common two- and three-dimensional objects according to their most visible characteristics. In this lesson, students investigate how simple 2D shapes relate to more complex 3D objects. This video lesson will explain the difference between 2D and 3D shapes. Pay attention to the shape names. You will understand 3D shapes and their vertices, edges, and faces after viewing the video. If you don't grasp a term or shape, ask your parents or guardians for help. Please share your findings in the comments. If necessary, parents or guardians may assist you with typing.

The full transcript is available below the video. Please watch the video. Have a good time!


Video transcript of 2D and 3D shapes.

Oh, hey kids, it’s Mr. B and banjo Bob. Hurry, kids, and today we are

 going to learn about shapes. You know there are so many different

 kinds of shapes. There are 2d shapes, and there are 3d shapes. But

 Mr. B, how do you tell the difference between 2d and 3d shapes?

 That is a great question, Bob. 2d means two-dimensional. Can you

 try saying that two-dimensional? Two-dimensional is very good,

 Bob; thank you. Two-dimensional means the shape goes two ways;

 look at the square. It goes two ways; it goes side to side, and it goes

 up and down one way two ways; this shape is two-dimensional.

 Wow, now a 3d shape goes three ways. It also goes side to side, it

 goes down and up, and it also goes from back to front, back to front.

 Did you catch that, Bob? Yeah, a 3d shape goes side to side, up and

 down, and back to front, another way to test. If a shape is 2d or 3d,

 it is to see if it’s flat because if it’s flat, it’s a 2d shape. Let’s try the

 circle first and turn it overtake a good look that looks pretty flat to

 me; a circle must be a 2d shape. Now let’s try the sphere; rotate it

 over. This sphere is still pretty puffy and full. It must be a 3d shape

. We can further experiment with the flatness of a shape by doing the

 clapping test. Are you ready for that, Bob? You bet. Remember, if

 the shape is flat, it’s a 2d shape, and you should still be on the clap.

 Now let’s try the 3d shape. Oh, no, the 3d shape is too puffy; it

 sticks out too much. I can’t clap, sorry, Bob. the music’s over. If

 you’re still unsure if a shape is 2d or 3d, there is another way to test.

 But leave this one to me because it’s dangerous, all right? It’s called

 the sit test. Here’s what’s going to happen. Bob’s going to put a

 shape behind me, and I’m going to sit down if it’s a 3d shape. I

 should be able to sit because 3d shapes are full and stick out. But if

 it’s a 2d shape, I might be in some trouble. Are you ready, Bob?Give

 me the first shape, okay, Mr. B? Here comes a sphere. Wow, a

 sphere must be a 3d shape. It sticks out three ways and keeps me off

 the ground, thanks Bob; good job, Mr. B. how about another one?

 Yep, Bob, I’m ready; give me the next shape, okay, Mr. B? how

 about a rectangular prism? Whoa, rectangular prism must be a 3d

 shape. Because it kept me off the ground, Bob, that’s crazy. It goes

 side to side, front to back, and up and down to keep me from falling.

 Okay, pretty cool guys, Mr. B; time for the last shape. I’m ready

 when you are. Bob, please give me the last shape, okay? Let’s try a

 triangle; oh no, that wasn’t a 3d shape. Mr. B., You’re right, Bob;

 this was a 2d shape; it only goes two ways this way, but it didn’t

 come up, so I couldn’t sit on it and fell on the ground. It’s so flat I

 went down fast. Bob, I think I’m done with shapes for today; how

 about I play your favourite song and make you feel better? That’d be

 great, Bob, thanks. Okay, I don’t feel better, and I did have fun

 today, and I hope you did too. It’s your turn to find some shapes and

 learn something, all right, boys and girls. See you next time bye-bye.

You achieve your objective! It might be beneficial if you returned to

 undertaking activities or quizzes.