  # Choose the Correct Trigonometric Ratio

In this worksheet, students select the correct trigonometric ratio to find the given angle. Key stage:  KS 3

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Solve Right-Angled Triangle Problems

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 ? 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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