# Know when to use Pythagoras or Trigonometry to solve problems

In this lesson, we will recognise when it is appropriate to use Pythagoras or Trigonometry when finding missing lengths and angles in right angle triangles.

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.A ship sales 15 km on a bearing of 060° from a point P. How far East of its original position is it? Give your answer to 2 decimal places.

2/3

Q3.A plane flies 100 km due east from point A to reach point B. It then flies 30 km due south to reach point C. What bearing is C from A?

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!

Q1.

1/3

Q2.A ship sales 15 km on a bearing of 060° from a point P. How far East of its original position is it? Give your answer to 2 decimal places.

2/3

Q3.A plane flies 100 km due east from point A to reach point B. It then flies 30 km due south to reach point C. What bearing is C from A?

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:

# Know when to use Pythagoras or Trigonometry to solve problems

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

Q1.Would you use Pythagoras or Trigonometry to work out x?

1/3

Q2.Find 𝑥 in the triangle. Give your answer to one decimal places.

2/3

Q3.Which of these could you use to work out x?

3/3

Quiz:

# Know when to use Pythagoras or Trigonometry to solve problems

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

Q1.Would you use Pythagoras or Trigonometry to work out x?

1/3

Q2.Find 𝑥 in the triangle. Give your answer to one decimal places.

2/3

Q3.Which of these could you use to work out x?

3/3

# Lesson summary: Know when to use Pythagoras or Trigonometry to solve problems

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga