3D SOLIDS AND NETS
NHÓM 3
3
4
1
2
3
4
1
2
1. Introduction to the Problem
How many faces, sides, tops are there in each 3D solid?
?
How can you recognize 3D solids object?
Can we calculate the volume of 3D solids object?
?
?
How can you recognize 3D solids object?

3
4
1
2
2. 3D Solids and Nets:
2.1. Part 1: How to classify and understand 3D Solids and Nets.
!
Classify and sort shapes and solids using the properties of lines (orientation and size), angles (less than, equal to, or greater than 90°), and surfaces.
Solids we use everyday
!
2. 3D Solids and Nets:
2.1. Part 1: How to classify and understand 3D Solids and Nets.
Work in pairs:
Select a net and make a 2D drawing of it on squared paper.
!
Cut out your net and shape it into a 3D model
https://www.geogebra.org/m/exzuzjbj?fbclid=IwAR2T5DoBtXM10EytGMPcNTt4q7WLnN6HBiOViB4Bg2QMSl-AU-PUyADFRN4
Overview of splitting the faces of a box into a flat shape
NET OF SOLIDS !!!
How to make a 3D solid ?
Watch this video and discuss…
2. 3D Solids and Nets :
2.1. Part 1: How to classify and understand 3D Solids and Nets.
?
One face of a 3D shape looks like this
What could it be? Are there any other possibilities? Prove it! Explain your solution
Conclusion
Why do we need nets at all?
Being able to understand how a three-dimensional shape is made up of two-dimensional components is not only a useful skill if you need to construct a box, but is also vitally important in any aspect of 3D design.
Work with a partner ! ! !
CHECK!!!
2. 3D Solids and Nets:
2.2. Part 2: Practice to create 3D Solids and Nets in reality.
!
Work in group:
Apply all this new-found knowledge to a design project
Example:
You will have a low sugar recipe for both a main meal and a dessert. Your challenge is to design ECO packaging which will enable these to be take away – in ONE parcel.
HOW to create 3D Solids and Nets in reality
+ Cardboard for students to make their own nets
+ Scissors.
+ Pens, pencils, rulers, erasers
+ Sticky tape.
+ Recycled materials/ Reused materials.
+ Nets of four 3D shapes: cube, cuboid, pyramid
+ Glue.
2. Main activities:
2.2. Part 2: Practice to create 3D Solids and Nets in reality.
!
Work in group:
Prepare materials:
Apply all this new-found knowledge to a design project
How to make a 3D Cylinder ? ? ?
3
4
1
2
3. Discussing:
Display and explain your information
!
+ Rectangular parallelepiped
+ Cube
+ Pyramid
Rectangular parallelepiped
Cube

Pyramid
3
4
1
2
4. Summing up:
What have you learnt throughout the lesson ?
?
How do you determine the vertices, surfaces and sides ?
?
MIND MAPS colutions