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Create New Shapes From Existing Ones

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Create New Shapes From Existing Ones

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What you will learn from this videoWhat you will learn

We'll learn how to put together 2D shapes to make new shapes.
We’ll also learn how to make 3D shapes from 2D shapes.
And we'll explore how this knowledge can help us make origami, quilts and even pizza!

Discussion Questions
- Before Video
  [Hold up or draw a square.] What shape is this? How do you know?ANSWER
  - It’s a square because it has four square corners and four sides all the same length.
  [Hold up or draw a triangle.] What shape is this? How do you know?ANSWER
  - It’s a triangle because it has three sides.
  [Hold up or draw a different triangle.] What shape is this? How do you know?ANSWER
  - It’s also a triangle because it also has three sides.
  [Hold up a cube.] What shape is this? How do you know?ANSWER
  - It’s a cube because it is a 3D shape with six square faces.
  [Hold up a cylinder.] What shape is this? How do you know?ANSWER
  - It’s a cylinder because it is a 3D shape with circles on both ends.
- After Video
  [Hold up or draw two identical right triangles with all three sides of different lengths.] How can you use these shapes to make a rectangle?ANSWER
  - Put the two triangles next to each other with the long sides together.
  [Use the rectangle created in the previous question and another identical rectangle.] How can you use these two rectangles to make a new rectangle?ANSWER
  - Put the two rectangles together. You can put the long sides together or the short sides together.
  [Hold up or draw three identical equilateral triangles.] How can you use these three shapes to make a trapezoid?ANSWER
  - Put the triangles together. The middle triangle is upside-down compared to the other two triangles.
  [Hold up or draw six rectangles that could form a rectangular prism. To make sure they could form a rectangular prism, you can use a cereal or tissue box as a model. Or, make two rectangles with dimensions a × b, two with dimensions a × c, and two with dimensions b × c.] What 3D shape can you make from these six shapes?ANSWER
  - A rectangular prism.
  [Hold up or draw three identical cylinders.] How can you use these shapes to make a new cylinder?ANSWER
  - Stack all three cylinders together so the circular faces line up.
Vocabulary
- 2D DEFINE
- 3D DEFINE
- Cube DEFINE
- Circle DEFINE
- Triangle DEFINE
- Rectangle DEFINE
- Square DEFINE
- Trapezoid DEFINE
- Parallel DEFINE
- Hexagon DEFINE
- Rectangular Prism DEFINE
Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket

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