It is asking you to use what you know about 3-D shapes to write the shape letters in the correct place on the Venn diagram.
Let's practise
Write the shape letters in the correct place in the Venn diagram.
- Read the question and then read it again. What is it asking you to do?
Show me
- Which properties must you use to sort the 3-D shapes in the Venn diagram?
Remember that some shapes may have both properties and some may have neither property.
Show me
Shapes with an even number of edges.
Shapes with at least one triangular face.
- Think carefully about the words being used to describe the properties. What do they mean?
Show me
Each surface of a 3-D shape is called a face.
Pairs of faces meet at an edge.
- Look at each of the shapes in turn and then decide which properties they each have.
OR
Look at the properties in turn and then decide which shapes have these properties.
Show me
The cuboid (A) and the cube (E) both have 12 edges and no triangular faces.
The sphere (B) has no edges and a curved surface.
The square-based pyramid (C) and the triangular prism (D) both have triangular faces, but shape C has eight edges and shape D has nine.
- Now start to decide where each shape goes in the Venn diagram. Remember:
• a shape with both properties goes in the overlapping area
• a shape with neither of these properties goes outside the sets.
Now continue by placing shapes A, E and D.
Show me
The squared-based pyramid (C) must go in the overlapping area as it has both properties.
The sphere (B) goes outside the sets as it has neither of these properties.
- What is your answer?
Double check it.
Show me
