Topics
11. Shapes and angles
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Australia
Year 3

11.03 Right angles

Lesson
Practice
Lesson

Are you ready?

Being able to  compare angles  can help us in this lesson. Let's try this problem to review.

Examples

Example 1

Which of these angles is larger?

A
Image of a right angle.
B
Image of an obtuse angle
Worked Solution
Create a strategy

Choose the option with a larger turn between the lines.

Apply the idea

The answer is option B.

Idea summary

Angles can be compared by how large the turn is between the lines.

Right angles

Let's learn about right angles and how we can compare other angles to them.

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Examples

Example 2

Which of the following is a right angle?

A
A right angle
B
An acute angle.
Worked Solution
Create a strategy

Look for the angle with a small square in the corner.

Apply the idea

Option A has a small square at the corner, so the answer is option A.

Idea summary

A right angle is exactly 90\degree.

Outcomes

AC9M3M05

identify angles as measures of turn and compare angles with right angles in everyday situations

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