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mathematicsprinted 105 · PDF 106
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printed 105 · PDF 106
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105
You need to remember this mnemonic to solve questions related to
trigonometry. A different function is to be used depending on what side
lengths/angles are given and each one is used for a specific scenario. Let's
look at an example.
The functions in red correspond to the angle a and the functions in blue
correspond to the angle c. Here you can also see that the names of sides
change depending on which angle is being looked at. Let’s look at an
example.
Look at the available data and what the question is asking for. Side length AB
and angle ACB is given and we need to find side AC. First, label all the sides
with respect to the angle ACB (done in red). Now identify which function will
be applied. The opposite is known and the hypotenuse needs to be