Topics
12. Solids
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Australia
Year 3

12.01 Prisms

Lesson
Practice
Lesson

Introduction

Introduction to the lesson

Are you ready?

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

Examples

Example 1

How many edges does each shape have?

a
An image of a square.
Worked Solution
Create a strategy

Count the number of straight lines that go around the shape.

Apply the idea

There are 4 edges.

b
An image of a Kite.
Worked Solution
Create a strategy

Count the number of straight lines that go around the shape.

Apply the idea

There are 4 edges.

Idea summary

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

Prisms

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.

Loading video...

Examples

Example 2

Here is a rectangular prism.

An image of a rectangular prism.
a

How many faces does it have?

Worked Solution
Create a strategy

Faces are the flat sides of a solid.

Apply the idea

It has 6 faces.

b

How many vertices does it have?

Worked Solution
Create a strategy

Vertices are the corners where edges meet.

Apply the idea

It has 8 vertices.

c

How many edges does it have?

Worked Solution
Create a strategy

An edge is the line where two faces meet.

Apply the idea

It has 12 edges.

Idea summary

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

Outcomes

AC9M3SP01

make, compare and classify objects, identifying key features and explaining why these features make them suited to their uses

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