# Prove triangles are congruent

In this lesson, we will learn how to prove that two triangles are congruent. We will investigate four different conditions involving observation and comparison of the angles and sides of each triangle. If any condition is met, we can determine that the triangles are congruent.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.

1/3

Q2.

Select two (2) boxes

2/3

Q3.

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.

1/3

Q2.

Select two (2) boxes

2/3

Q3.

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.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Prove triangles are congruent

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

Q1.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the SSS conditions. Choose all that apply.

Select two (2) boxes

1/3

Q2.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the ASA conditions. Choose all that apply

2/3

Q3.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the SAS conditions. Choose all that apply.

Select two (2) boxes

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Prove triangles are congruent

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

Q1.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the SSS conditions. Choose all that apply.

Select two (2) boxes

1/3

Q2.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the ASA conditions. Choose all that apply

2/3

Q3.ABCD is a parallelogram. Select the working that proves triangles ABC and BCD are congruent using the SAS conditions. Choose all that apply.

Select two (2) boxes

3/3

# Lesson summary: Prove triangles are congruent

## Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga