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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?ANSWERIt’s a square because it has four square corners and four sides all the same length.
It’s a triangle because it has three sides.
It’s also a triangle because it also has three sides.
It’s a cube because it is a 3D shape with six square faces.
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?ANSWERPut the two triangles next to each other with the long sides together.
Put the two rectangles together. You can put the long sides together or the short sides together.
Put the triangles together. The middle triangle is upside-down compared to the other two triangles.
A rectangular prism.
Stack all three cylinders together so the circular faces line up.
- Vocabulary
- 2D DEFINE
2D stands for two-dimensional. Two-dimensional shapes are flat, like squares and circles.
- 3D DEFINE
3D stands for three-dimensional. Three-dimensional shapes are solid, like cubes and cylinders.
- Cube DEFINE
A solid shape with six square faces
- Circle DEFINE
A flat shape that is round with no sides or corners.
- Triangle DEFINE
A flat shape with three sides.
- Rectangle DEFINE
A flat shape with four sides and four square corners.
- Square DEFINE
A flat shape with four sides, four square corners, and all sides the same length.
- Trapezoid DEFINE
A flat shape with four sides and at least one pair of sides that is parallel.
- Parallel DEFINE
Two lines or sides that are always the same distance apart.
- Hexagon DEFINE
A flat shape with six sides.
- Rectangular Prism DEFINE
A solid shape with six rectangular faces.
- 2D DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide