# 2D Shapes on 3D Shapes

8 teachers like this lesson
Print Lesson

## Objective

SWBAT identify the two-dimensional shapes that make up the faces of three-dimensional shapes.

#### Big Idea

In this lesson, children learn to identify and distinguish the shapes of the flat surfaces of three-dimensional shapes.

## Activating Strategy

10 minutes

I start this lesson by handing out 3D shapes and play-doh to each student, or pairs of students.  I review which shapes have flat surfaces.  I instruct the students to press the flat surface of their 3D shapes into their play-doh.  We have a class discussion about the different types of 2D shapes that are made using 3D shapes.

Warning: this is a very fun, tactile, and (potentially messy) activity! I make sure to warn students ahead of time that any silliness with the play-doh will result in, you guessed it, no more play-doh.

For the standard G.A1, I have found that some students may have difficulty recognizing the two-dimensional shape on the three-dimensional shapes.  To help overcome this, students press the flat surface of their 3D shape into the play-doh.  This allows for them to see the 2D shape that makes up our 3D shapes.  Thus, the activity makes the abstract visualization more concrete.

## Teaching Strategies

15 minutes

Then using models of 3D shapes, I instruct students to look at their cone.  I read the following problem aloud:

Lee places a cone on a piece of paper and draws around its flat surface. What shape did Lee draw?

Then I have children hold a cone and turn it around in different ways to observe its surfaces. Make sure all children have a chance to hold and turn the cone.

• How many flat surfaces does a cone have? (1 flat surface)
• How can you trace around the flat surface? (I put the flat surface down on the paper, and then I draw around where the shape meets the paper.)
• What other kind of surface does a cone have? (a curved surface)

I then display the first on the 2D shapes on 3D shapes.ppt.  I work through the model with children and make sure they understand that the six rectangles represent the six flat surfaces of the rectangular prism. I have children trace around each side.

• How are the shapes you drew alike? How are they different? (They all have four sides.  The rectangles are not all the same size.)

## Independent Practice

30 minutes

Students complete a 2D shapes on 3D shapes_worksheet.docx for the independent portion of this lesson.  I work through the first question (slide 2) with the students prior to letting them work independently.

## Closing/Summarizing

5 minutes

To close out the lesson, I have students write in their journals to tell me which 2D shape is found on the following: cube, cone, cylinder, and rectangular prism.