# Constructing triangles

In this lesson, we will learn how to construct triangles using a pair of compasses and ruler given the length of the sides. We will need a pair of compasses, pencil and ruler for this lesson.

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!

Q1.Label this part of the circle

1/6

Q2.Label this part of the circle

2/6

Q3.Label this part of the circle

3/6

Q4.What is the circumference of a circle?

4/6

Q5.Complete the sentence. The diameter of a circle is...

5/6

Q6.The radius of my circle is 8.5cm. What is the diameter of the circle?

6/6

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!

Q1.Label this part of the circle

1/6

Q2.Label this part of the circle

2/6

Q3.Label this part of the circle

3/6

Q4.What is the circumference of a circle?

4/6

Q5.Complete the sentence. The diameter of a circle is...

5/6

Q6.The radius of my circle is 8.5cm. What is the diameter of the circle?

6/6

# 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:

# Constructing triangles Quiz

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If you know the length of the sides of a triangle, you can _______ it using a pair of ______.

1/5

Q2.This circle is drawn on a centimetre square grid. State the radius and diameter.

2/5

Q3.This circle is drawn on a centimetre square grid. State the radius and diameter.

3/5

Q4.This circle is drawn on a centimetre square grid. State the radius and diameter.

4/5

Q5.Two students were asked to construct a triangle with side lengths 3 cm , 2 cm and 4 cm. Are they both correct?

5/5

Quiz:

# Constructing triangles Quiz

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.If you know the length of the sides of a triangle, you can _______ it using a pair of ______.

1/5

Q2.This circle is drawn on a centimetre square grid. State the radius and diameter.

2/5

Q3.This circle is drawn on a centimetre square grid. State the radius and diameter.

3/5

Q4.This circle is drawn on a centimetre square grid. State the radius and diameter.

4/5

Q5.Two students were asked to construct a triangle with side lengths 3 cm , 2 cm and 4 cm. Are they both correct?

5/5

# Lesson summary: Constructing triangles

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance