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Recognise the Correct Trigonometric Ratio

In this worksheet, students will select the correct trigonometric ratio to find the given angle.

'Recognise the Correct Trigonometric Ratio' worksheet

Key stage:  KS 3

Year:  Year 9 Maths worksheets

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Solve Right-Angled Triangle Problems

Popular topics:   Geometry worksheets

Difficulty level:  

Worksheet Overview

In a right-angled triangle, the sides and the angles are connected by three trigonometric ratios.

 

 

The three trig ratios are:

 

 

A quick way to remember this is to memorise the word

 

SOHCAHTOA

 

Example

Which trigonometric ratio is used to calculate the angle θº ?

 

 

Answer

Label the sides adjacent, opposite and hypotenuse in relation to the angle θº.

The given sides are the adjacent and the hypotenuse.

 

 

SOHCAHTOA

 

The correct trig ratio is COS.

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