Area of triangles

In this lesson, you will learn to calculate the area of triangles and link the area of triangles to the area of parallelograms.

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!

Q1.Fill in the gaps, in the correct order: The area of a parallelogram is equivalent to the area of a ____________ with the same width and _______________ height.

1/5

Q2.Find the area of this parallelogram.

2/5

Q3.Find the area of this parallelogram.

3/5

Q4.Find the area of this parallelogram.

4/5

Q5.Find the area of this parallelogram.

5/5

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!

Q1.Fill in the gaps, in the correct order: The area of a parallelogram is equivalent to the area of a ____________ with the same width and _______________ height.

1/5

Q2.Find the area of this parallelogram.

2/5

Q3.Find the area of this parallelogram.

3/5

Q4.Find the area of this parallelogram.

4/5

Q5.Find the area of this parallelogram.

5/5

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:

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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:

Area of triangles quiz

Make sure you've completed the lesson and worksheet before having a go at these questions.

Q1.Fill in the gap: We can find the area of a triangle using the width of a base and the __________ height.

1/5

Q2.Fill in the gap: The triangle will have half the area of the _______________ formed with the same dimensions.

2/5

Q3.Find the area of this right-angled triangle.

3/5

Q4.A triangle has a base of 3cm and a perpendicular height of 4cm. What is its area?

4/5

Q5.A triangle has an area of 48 mm² and a perpendicular height of 8 mm. What is the length of its base?

5/5

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:

Area of triangles quiz

Make sure you've completed the lesson and worksheet before having a go at these questions.

Q1.Fill in the gap: We can find the area of a triangle using the width of a base and the __________ height.

1/5

Q2.Fill in the gap: The triangle will have half the area of the _______________ formed with the same dimensions.

2/5

Q3.Find the area of this right-angled triangle.

3/5

Q4.A triangle has a base of 3cm and a perpendicular height of 4cm. What is its area?

4/5

Q5.A triangle has an area of 48 mm² and a perpendicular height of 8 mm. What is the length of its base?

5/5

Lesson summary: Area of triangles

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The next lesson in:
Area of 2-D shapes
is:
Further triangles

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