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.
The correct trig ratio is COS.
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