To recognise obtuse and acute angles

In this lesson, we will be building on our angle knowledge by introducing the terms acute and obtuse for those angles which are smaller (acute) and greater (obtuse) than right-angles. We will have time to look at these angles separately and within different shapes.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Q1.A right angle is a

1/3

Q2.A square contains how many right angles?

2/3

Q3.In order to indicate that an angle is a right angle, what shape can we draw on the angle?

3/3

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Question 1

Question 2

Question 3

Q1.A right angle is a

1/3

Q2.A square contains how many right angles?

2/3

Q3.In order to indicate that an angle is a right angle, what shape can we draw on the angle?

3/3

Video

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Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Final knowledge quiz

Let's see what you have learnt about acute and obtuse angles

Question 1

Question 2

Question 3

Question 4

Q1.Which angle is smaller than a right angle?

1/4

Q2.Which angle that we have been looking at today is greater than a right angle?

2/4

Q3.This triangle contains an obtuse angle. True or false?

3/4

Q4.What type of angles are in this triangle?

4/4

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Final knowledge quiz

Let's see what you have learnt about acute and obtuse angles

Question 1

Question 2

Question 3

Question 4

Q1.Which angle is smaller than a right angle?

1/4

Q2.Which angle that we have been looking at today is greater than a right angle?

2/4

Q3.This triangle contains an obtuse angle. True or false?

3/4

Q4.What type of angles are in this triangle?

4/4

Lesson summary: To recognise obtuse and acute angles

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