Compare and order angles

Learning focus

Learn to compare angles and identify acute, obtuse and right angles.

This includes:

  • a quiz
  • two videos
  • two interactive activities

Quiz

To get started, let's see how well you know this topic already. Take the quiz below to find out.

Learn

In this lesson you will think about the size of an angle. Is it larger than, equal to, or smaller than a right angle?

You'll think about how an angle measures the size of the turn. You can think of a right angle as a quarter turn.

An obtuse angle is always greater than a right angle, or an acute angle, because it represents more of a turn. It doesn’t matter how big the lines that make the angle are.

In this video you will learn how to identify whether an angle is a right angle, an obtuse angle or an acute angle by thinking about the size of the turn.

In this video you will think about angles in a real-life situation.

You will think about how to reason about angles and explain your answer, even when it’s something you can know just by looking.

Practise

Activity 1

Sort the angles

This activity helps you practise comparing and ordering angles. In question 3, which angles will you look at in each shape?

Open the worksheet below and write your answers on paper or print the worksheet and fill it in.

Sort the angles
document

Click here for the answer sheet

Activity 2

Compare and order angles

These questions help build your confidence in identifying and comparing angles.

Read each question carefully. How is the question asking you to sort the angles? It isn’t always in ascending order.

Compare and order angles
document

Click here for the answer sheet

Play

Play Guardians: Defenders of Mathematica to learn more and sharpen your skills on this topic.

Guardians: Defenders of Mathematica

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