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Trigonometric ratios can be used in right-angled triangles.

 

Before you choose the most appropriate trig ratio, you must be able to label the sides of a right-angled triangle correctly in relation to the angle.

 

 

trigonometry ratio triangle

 

Look at the triangle above.

The angle θº  is shown.

 

The side opposite the right angle is called the HYPOTENUSE.  It is the longest side.

 

The side opposite the angle θº  is called the OPPOSITE side.

 

The side next to and touching the angle θº  is called the ADJACENT side.

 

Let's try some questions now.

10 questions