How many edges does a triangular prism have?
- The two triangular faces each have 3 edges: 2 3 = 6.
- Three more edges join corresponding vertices, so 6 + 3 = 9.
Answer
GCSE Maths revision · Geometry and measures
The idea
A plan is the view from above; a front or side elevation is the view from the front or side. Each is a flat 2D drawing, with no perspective.
- Picture looking straight down (plan) or straight at a face (elevation).
- Draw only what you would see, with full lines for edges.
- Use the grid to keep each length to scale.
Watch out An elevation is flat: do not draw it as a 3D sketch.
See it worked
Your turn
A triangular prism has two triangular ends joined by rectangles.
(a) Write down the number of faces of a triangular prism.
(b) Write down the number of edges.
(c) Write down the number of vertices.
A solid is made from unit cubes in six stacks on a 3-column by 2-row rectangular base. From left to right, the front-row stack heights are 2, 1 and 4 cubes; the back-row heights are 3, 5 and 2 cubes. There are no gaps inside any stack. How many unit squares are in the front elevation?
A cuboid has front width 1.2 m, height 0.75 m and depth 40 cm. Its front face is viewed straight on.
(a) Which shape is the front elevation? Select one answer.
(b) Find the area of the front elevation in square centimetres.
(c) Find the volume in litres. Use 1000 cubic centimetres = 1 litre.
In past papers
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