Use inverse functions to find an angle

Use inverse functions to find an angle

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Lesson details

Key learning points

  1. 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.

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3 Questions

Q1.
Use your calculator find the value of cos(56) to 3 decimal places.
Correct answer: 0.559
0.560
0.829
Others
Q2.
Use your calculator find the value of tan(89) to 3 decimal places.
1.000
Correct answer: 57.290
Error
Others
Q3.
3. Use your calculator to work out the size of sinѲ = 0.21 . Give your answer to one decimal place.
Correct answer: 12.1 degrees
21.0 degrees
Error
Others

3 Questions

Q1.
Which of the trigonometry ratios will be required to find the missing angle in this question?
An image in a quiz
inverse cosine
Correct answer: inverse sine
inverse tangent
Q2.
Find the missing angle, giving your answer to 1 decimal place.
An image in a quiz
Correct answer: 17.9 degrees
60 degrees
72.1 degrees
Q3.
Find the missing angle, giving your answer to 1 decimal place.
An image in a quiz
27.6 degrees
Correct answer: 41.6 degrees
48.4 degrees

Lesson appears in

UnitMaths / Trigonometry 2