# Know when to use Pythagoras or Trigonometry to solve problems

Recognise when it is appropriate to use Pythagoras or Trigonometry when finding missing lengths and angles in right angle triangles.

# 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.

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

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This was the final lesson in the unit Trigonometry 3.