Topics
13. Shapes and angles
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Stage 2

13.01 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

MA2-15MG

manipulates, identifies and sketches two-dimensional shapes, including special quadrilaterals, and describes their features

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