Topics
9. Shapes and position
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Australia
Year 4

9.01 Names and properties of shapes

Lesson
Practice
Lesson

Are you ready?

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?

The image shows a rectangle.
Worked Solution
Create a strategy

Count the number of corners of the rectangle where two edges meet.

Apply the idea

Vertices = 4

Idea summary

Vertices are the corners where two edges meet.

Shape names and properties

This video shows you how to classify shapes based on a number of key features including sides, angles, and vertices.

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Examples

Example 2

How many angles are there inside the following shapes?

a
The image shows a triangle.
Worked Solution
Create a strategy

Count how many of these spaces there are inside the triangle.

The image shows a triangle with an arrow pointing to one angle.
Apply the idea

There is an angle at each corner of the triangle. There are 3 corners.

There are 3 angles.

b
The image shows a hexagon with equal sides and angles.
Worked Solution
Create a strategy

Count how many of these spaces there are inside the hexagon.

The image shows a hexagon with an arrow pointing to one angle
Apply the idea

There is an angle at each corner of the hexagon. There are 6 corners.

There are 6 angles.

Idea summary

To name a shape, look at its key features, including sides, angles, and vertices.

Outcomes

ACMMG088

Compare and describe two dimensional shapes that result from combining and splitting common shapes, with and without the use of digital technologies

What is Mathspace

About Mathspace