# 12.02 Pyramids

Lesson

## Ideas

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

### Examples

#### Example 1

How many vertices does this shape have?

Worked Solution
Create a strategy

Vertices are the corners where two edges meet.

Apply the idea

It has 4 vertices.

Idea summary

Vertices are the corners where two edges meet.

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

## Pyramids

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.

### Examples

#### Example 2

Here is a square pyramid:

a

How many faces does it have?

Worked Solution
Create a strategy

Faces are the flat sides of a solid object.

Apply the idea

It has 5 faces: the 4 triangles and the 1 square base.

b

How many vertices does it have?

Worked Solution
Create a strategy

Vertices are the corners where two edges meet.

Apply the idea

It has 5 vertices.

c

How many edges does it have?

Worked Solution
Create a strategy

An edge is where two faces meet.

Apply the idea

It has 8 edges.

Idea summary

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

### Outcomes

#### MA2-14MG

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