2. Measurement and Geometry 25
prisms
non-prisms

3. prism cube 6 square faces 12 edges 8 vertices
Measurement and Geometry 25

4. 2 flat surfaces are circles
not a prism
cylinder
2 flat surfaces
1 curved surface
2 flat surfaces are circles
Measurement and Geometry 25

5. 2 flat surfaces, 1 curved surface and 2 curved lines.
The three-dimensional object has
2 flat surfaces,
1 curved surface and
2 curved lines.
What object did I describe?
Measurement and Geometry 25

6. 5 faces, 9 edges and 6 vertices. The three-dimensional object has
What object did I describe?
Measurement and Geometry 25

7. Reflection: How can we identify three-dimensional objects?
Investigation:
Sit in pairs or small groups.
Select three-dimensional objects.
Take turns to select an object.
The friends describe and name the object, including naming it a prism or non-prism.
Take turns to describe one of the objects without touching the object, naming the object a prism or non-prism.
The friends suggest what object it could be.
Reflection: How can we identify three-dimensional objects?
In my hand I have an object which is a prism.
It has 6 faces.
Its faces are all squares.
What object do I have?
In a bag I can feel an object that is not a prism.
It has 2 flat surfaces and 1 curved surface.
The flat surfaces are circles.
What object do I have?
Measurement and Geometry 25

8. Measurement and Geometry 24

9. Reflection: How can we identify three-dimensional objects?
Investigation:
Have a selection of prisms.
Take it in turns to
• select a prism without touching it
• describe the faces as a two-dimensional shapes
• describe the flat surfaces with straight lines as faces and edges
• name the shape a prism or non-prism.
Your friends identify the prism from the description.
Reflection: How can we identify three-dimensional objects?
Measurement and Geometry 25

10. Reflection: How can we identify three-dimensional objects?
Investigation:
Have a selection of non-prisms.
Take it in turns to
• select a non-prism without touching it
• describe the faces as a two-dimensional shapes
• describe the flat surfaces with curved lines as flat surfaces and curved lines
• name the shape a prism or non-prism.
Your friends identify the non-prism from the description.
Reflection: How can we identify three-dimensional objects?
Measurement and Geometry 25

11. Reflection: How can we identify three-dimensional objects?
Investigation:
Sit in pairs or small groups.
Have a bag in which an object has been placed.
One child:
• places their hand into the bag and describes the object.
• names their object a prism or non-prism.
The other child / children suggest what object it could be.
Reflection: How can we identify three-dimensional objects?
Measurement and Geometry 25

12. Reflection: How can we identify three-dimensional objects?
Investigation:
Sit with some friends.
Have some objects.
Take turns to describe the surfaces of one of the objects, without touching the object, naming the object a prism or non-prism.
The friends suggest what object it could be.
Reflection: How can we identify three-dimensional objects?
Measurement and Geometry 25

13. Reflection: How can we identify three-dimensional objects?
Investigation:
Sit with some friends.
Have some objects.
Take turns to describe the surfaces of one of the objects, without touching the object, naming the object a prism or non-prism.
The friends suggest what object it could be.
Reflection: How can we identify three-dimensional objects?
Measurement and Geometry 25