# 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.

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 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

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 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

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# 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.

Quiz:

# Final knowledge quiz

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

## 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

Quiz:

# Final knowledge quiz

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

## 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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