 # 12.01 Prisms

Lesson

## Introduction

Introduction to the lesson

## Ideas

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
Worked Solution
Create a strategy

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

Apply the idea

There are 4 edges.

b
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.

### Examples

#### Example 2

Here is 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

#### MA2-14MG

makes, compares, sketches and names three-dimensional objects, including prisms, pyramids, cylinders, cones and spheres, and describes their features