Lesson

Being able to identify the key features of shapes can help us in this lesson.

How many edges does each shape have?

a

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b

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Idea summary

An edge is a straight line that makes part of the perimeter of a shape.

This video looks at prisms, it starts with showing how a prism is made by looking at its net, and then looks at the faces, edges and vertices of a prism.

Here is a rectangular prism.

a

How many faces does it have?

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b

How many vertices does it have?

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c

How many edges does it have?

Worked Solution

Idea summary

A prism can be made with any polygon at its base.

This video looks at pyramids, it starts with showing how a pyramid is made by looking at its net, and then looks at the faces, edges and vertices of a pyramid.

Here is a square pyramid:

a

How many faces does it have?

Worked Solution

b

How many vertices does it have?

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c

How many edges does it have?

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Idea summary

Pyramids can have different bases, and the name of the base tells us the name of the pyramid.

This video looks at cones, spheres, and cylinders. All these shapes have curved surfaces. Let's see how we can tell which one is which.

Here is a cone.

a

How many curved surfaces does it have?

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b

How many vertices does it have?

Worked Solution

c

How many edges does it have?

Worked Solution

Idea summary

Cones, spheres and cylinders all have curved faces.

Connect three-dimensional objects with their nets and other two-dimensional representations