# Solve basic trigonometry equations

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## Lesson details

### Key learning points

1. In this lesson, we will use a calculator to work out values of angles by rearranging trigonometric equations relating to sides and angles and using inverse trigonometric functions.

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## Worksheet

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## Starter quiz

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### 3 Questions

Q1.
If b is the base, identify the perpendicular height of this triangle.
s
u
Q2.
Find the perpendicular height of the triangle.
0.0333… cm
1 cm
Q3.
Find the perpendicular height of the triangle. Give your answer to one decimal place.
5.9 cm
8 cm

## Exit quiz

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### 3 Questions

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