Year 7 Maths

Kookaburra week - Lesson 4

The properties of triangles

Introduction

Watch the video below for an introduction to the lesson.

Lesson overview

Duration 1:21

Activity 1 - Classifying triangles

Task 1

  1. Watch the video, Math Antics - Triangles.

  2. Pause the video at 04:22 and write the table into your workbook or folder

  3. Fill out the table with examples

  4. Continue the video to make sure your examples are accurate.

Math Antics - Triangles

Duration 7:39

Task 2

Complete the interactive to:

  1. Practise classifying triangles as:

    • scalene

    • isosceles

    • equilateral

    • acute angled

    • right angled

    • obtuse angled.

Note: The shape may fit into more than one category.

  1. Demonstrate your understanding of why triangles are classified the way they are.

Note: At the end of the interactive, make sure you use the blue Export text button to get your written answers in a document you can submit to your teacher.

Activity 2 - Angle sum of triangles

Task 1

  • You will need to have the following things ready before you start:

    • A4 piece of paper

    • pencil

    • ruler

    • scissors.

  • Draw 2 triangles of any size on your piece of paper.

  • Watch the video, Sum of Interior Angles of a Triangle.

  • Follow along with the video and complete the instructions using your triangles.

  • Stick the final product into your exercise book or folder.

  • In your exercise book or folder, underneath the triangles you stuck in, write the conclusion that you reached based on the video.

Sum of Interior Angles of a Triangle

Duration 2:26

Task 2

Complete the interactive to learn how to find unknown angles using the angle sum of a triangle.

Task 3

  1. Visit the Angles in a Triangle page on Transum.org.

    • Click on the image link to open the activity in a new tab.

  2. Complete the problems on the Level 1 page.

image link to Angles in a Triangle page on Transum.org

Task 4

  1. Visit the How Many Triangles page on Transum.org.

    • Click on the image link to open the activity in a new tab.

  2. Complete the questions.

image link to How Many Triangles page on Transum.org

Activities too easy?

Visit the Angles in a Triangle page on Transum.org and try to complete Level 2.

Handing in your work

Don't forget to hand in the work you completed today!

  • Your teacher will have told you to do one of the following:

    • Upload any digital documents you created and any photos you took of your written work to your Learning Management system (MS Teams, Google Classroom for example).

    • Email any digital documents you created and any photos you took of your written work to your teacher.

Make sure you keep any handwritten work you did in your exercise book or folder as your teacher may need to see these when you are back in class.