It is asking you to find the number of faces, edges and vertices on a tetrahedron.
Let's practise
Fill in the missing information about a tetrahedron.
Number of faces
Number of edges
Number of vertices
- Read the question and then read it again. What is it asking you to do?
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- Think carefully about the words being used to describe the properties. What do they mean?
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Each surface of a 3-D shape is called a face.
Pairs of faces meet at an edge.
Edges meet at a vertex (the plural is vertices).
- Visualise holding the shape and turning it round.
Start with the faces.
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There are four faces.
- Now look at the edges.
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There are six edges.
- And finally, the vertices.
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There are four vertices.
- What is your answer?
Double check it.
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Number of faces: 4
Number of edges: 6
Number of vertices: 4