3D shapes — Notes & Worked Examples Show / Hide
Explanation:
On any 3D polyhedron, Faces (F) are the flat 2D surfaces, Edges (E) are the lines where two faces meet, and Vertices (V) are the corner points where edges meet. You can check your count using Euler’s formula: F + V − E = 2.
A prism has the same cross-section all the way through its length (e.g. cuboid, triangular prism, cylinder), whereas a pyramid has a polygon base with triangular faces meeting at a single apex point at the top.
Example 1: Write down the faces, edges, and vertices of a triangular prism.
Example 2: Write down the faces, edges, and vertices of a square-based pyramid.
Dimensions: 5 cm by 3 cm by 2 cm.
Worked Solution & Answer
Complete the remaining three faces attached along matching edges. A1
Worked Solution & Answer
Worked Solution & Answer
This shape is folded along each dotted line to make a 3D shape.
Write down the name of this 3D shape.
(b) Which of the 3D shapes drawn has 5 faces, 9 edges and 6 vertices? Tick one box
[ ] A [ ] B [ ] C [ ] D [ ] E.
This shape is folded along each dotted line to make a 3D shape. [1 mark]
[ ] A [ ] B [ ] C [ ] D [ ] E. [1 mark]
Worked Solution & Answer
B (triangular prism): 5 faces (2 triangles + 3 rectangles), 9 edges, 6 vertices
C (cuboid): 6 faces, 12 edges, 8 vertices
D (tetrahedron): 4 faces, 6 edges, 4 vertices
E (cone): 2 faces, 1 edge, 1 vertex. B1