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Let's Sort Shapes and Objects

Today I will be... Identifying and describing 3-D shapes

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Mental Oral Starter

Which shape in this set do you think is the odd one out?

Explain your answer to a partner.

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Mental Oral Starter

The triangle is the odd one out.

All of the other shapes are quadrilaterals.

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Mental Oral Starter

Which shape in this set do you think is the odd one out?

Explain your answer to a partner.

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Mental Oral Starter

The regular hexagon is the odd one out.

All of the other shapes are irregular hexagons.

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Mental Oral Starter

Which shape in this set do you think is the odd one out?

Explain your answer to a partner.

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Mental Oral Starter

The cuboid is the odd one out. It is a 3-D shape.

All of the other shapes are 2-D.

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How would you describe the difference between these two set of shapes?

Share your ideas with the class.

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2-D shapes 3-D shapes

A 2-D shape has two measurements –

length and width. It is usually called a 'flat' shape.

A 3-D shape has three measurements –

length, width and depth. It is usually called a 'solid' shape.

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How many of these 3-D shapes can you name?

Think, pair, then share your answers.

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Pentagonal prism

ConeHexagonal

prismCylinder

Square-based pyramid

Triangular prism

SphereCuboidCube

How would you describe each of these 3-D shapes? What words would you use?

How many did you name? Do you know any other 3-D shapes?

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vertices

We describe 3-D shapes using the following words:

facesedges

Can you remember which part of a 3-D shape each word refers to?

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Face – the flat surface of a 3-D shape

Edge – a place where two faces meet

Vertex – a point where two or more edges meet

If a shape has more than one vertex, they are called vertices.

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How many faces, edges and vertices does a cube have?

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A cube has six faces, twelve edges and

eight vertices.

Did you get this right?

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How many faces, edges and vertices does a square-based pyramid have?

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A square-based pyramid has five faces, eight

edges and five vertices.

Did you get this right?

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How many faces, edges and vertices does a cone have?

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A cone has two faces, one edge and a vertex.

Did you notice?

One of the faces is curved. The edge is also curved.

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How many faces, edges and vertices does a hexagonal prism have?

...and now for a trickier one...

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A hexagonal prism has eight faces, eighteen

edges and twelve vertices.

Did you get this right?

Well done – this was tricky!

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Cube Cuboid

Both of these 3-D shapes have the same

number of faces, edges and vertices.

How else could you describe them so that

someone could identify each one?

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Cube Cuboid

A cube has six square faces.

This cuboid has four rectangular faces and two square faces.

You can describe the 2-D shapes of the faces:

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Now, think back to what you know about 2-D

shapes – can you remember what a

polygon is?

Think, pair then share your ideas.

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A polygon is a 2-D shape where the sides are all straight lines.

Did you remember this?

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Pentagonal prism

ConeHexagonal

prism Cylinder

Square-based pyramid

Triangular prism

SphereCuboidCube

A polyhedron is a 3-D shape where the faces are all polygons.

Which of these shapes are NOT polyhedrons?

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Polyhedrons Not polyhedrons

Can you explain why these three shapes

are not polyhedrons?

Cone CylinderSpherePentagonal

prism

Hexagonal prism

Square-based pyramid

Triangular prism

Cuboid Cube

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Back NextThink, pair, then share your ideas.

What does this set of 3-D shapes have in common?

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Prisms have the same 2-D shape on each opposite end.

The faces joining these two ends are rectangles.

They are all prisms!

Pentagonal prism

Triangular prism

Hexagonal prism

Octagonal prism

The 2-D shape on the opposite ends

is where the name for each prism comes from!

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Back NextThink, pair, then share your ideas.

What does this set of 3-D shapes have in common?

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They are all pyramids!

Square-based pyramid

Triangular-based pyramid

Pentagonal-based pyramid

Hexagonal-based pyramid

A pyramid has flat, sloping faces that all meet at a single point, or vertex. They are named according to the 2-D shape on their

bottom, or base.

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Now it's time to see what you have

learnt about 3-D shapes!

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Plenary

Agree or Disagree?

This cuboid can also be called a rectangular

prism.

Think, pair then share your ideas.

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Plenary

Agree!A prism has the same 2-D shape on each opposite end. The faces

joining these two ends are rectangles.

A cuboid is a special type of prism with its own name, because all of its faces are

rectangles.