Using inverse sine and cosine to find missing angles

Maths

Surds and trigonometry

Fill in the gap: You can use the inverse sine function to work out the unknown angle, when given the opposite and ................. in a right- angled triangle.

Fill in the gap: You can use the inverse cosine function to work out the unknown angle, when given the hypotenuse and ................. in a right- angled triangle.

Use the sine ratio to find out the missing angle in the triangle shown below.

Which is the correct method to work out the missing angle?

Which is the correct method to work out the length of missing side?

What is the length of the side marked r ?

What is the correct step for calculating the length of side b?

What is the length of of b correct to 1 decimal place?

What is the correct step for calculating the length of side a?

What is the length of a, correct to 1 decimal place?

Which ratio would you use to find the length of the missing side in the triangle below?

This lesson will be removed by end of Summer Term 2025.

Using inverse sine and cosine to find missing angles

Lesson outcome

This lesson will be removed by end of Summer Term 2025.