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ESSENTIAL SKILLS INVENTORY
Each different ratio has its own formula. These are shown below.
The ratio of
opposite
hypotenuse
= sine or sin
The ratio of
adjacent
hypotenuse
= cosine or cos
The ratio of
opposite
adjacent
= tangent or tan
The acronyms for the three ratios are:
Sine opposite hypotenuse – SOH
Cosine adjacent hypotenuse – CAH
Tangent opposite adjacent - TAS
NOTE
These acronyms are extremely helpful as they can be used to write out the three
different formulas and aid in solving trigonometry questions. These three formulas
can be changed into three formula triangles and then it is a matter of substituting
them into the formula. The three formula triangles are shown in Figure 9.
Figure 9 – Formula triangles
To use the formula triangles, cover the unknown and complete the remaining
calculation. Each formula triangle can be used to construct three variations.
B-7