# Use inverse functions to find an angle

In this lesson, we will find a missing angle in a given triangle using the inverse trigonometric functions. We will need to interpret which trigonometric ratio to use, and rearrange it.

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.

#### 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.Use your calculator find the value of cos(56) to 3 decimal places.

1/3

Q2.Use your calculator find the value of tan(89) to 3 decimal places.

2/3

Q3.Use your calculator to work out the size of sinѲ = 0.21 . Give your answer to one decimal place.

3/3

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.

#### 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.Use your calculator find the value of cos(56) to 3 decimal places.

1/3

Q2.Use your calculator find the value of tan(89) to 3 decimal places.

2/3

Q3.Use your calculator to work out the size of sinѲ = 0.21 . Give your answer to one decimal place.

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.

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.

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

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

# Use inverse functions to find an angle

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

Q1.Which of the trigonometry ratios will be required to find the missing angle in this question?

1/3

Q2.Find the missing angle, giving your answer to 1 decimal place.

2/3

Q3.Find the missing angle, giving your answer to 1 decimal place.

3/3

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.

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

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

# Use inverse functions to find an angle

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

Q1.Which of the trigonometry ratios will be required to find the missing angle in this question?

1/3

Q2.Find the missing angle, giving your answer to 1 decimal place.

2/3

Q3.Find the missing angle, giving your answer to 1 decimal place.

3/3

# Lesson summary: Use inverse functions to find an angle

## It looks like you have not completed one of the quizzes.

To share your results with your teacher please complete one of the quizzes.

## Time to move!

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

For 5 mins...

Move around:
Climb stairs

On the spot:
Dance