Trigonometry originated as part of the study of triangles. The name tri-gon-o-metry means the
measurement of three-cornered fi gures, and the first definitions of the trigonometric functions were
in terms of triangles. H wever, the trigonometric functions can also be defined using the unit circle,
a d finitioD that makes them periodic, or repeating. Many naturally occurring processes are also
periodic. The water lev 1 in a tidal basin, the blood pressure in a heart, an alternating current, and
the position of the air molecules transmitting a musical note aU fluctuate regularly. Such phenomena
can be represented by trigonometric fUllctions.
We use the three tligoDometric f unctions found on a calculator: the sine, the cosine, and the
tangent.
Trigonometry originated as part of the study of triangles. The name tri-gon-o-metry means themeasurement of three-cornered fi gures, and the first definitions of the trigonometric functions werein terms of triangles. H wever, the trigonometric functions can also be defined using the unit circle,a d finitioD that makes them periodic, or repeating. Many naturally occurring processes are alsoperiodic. The water lev 1 in a tidal basin, the blood pressure in a heart, an alternating current, andthe position of the air molecules transmitting a musical note aU fluctuate regularly. Such phenomenacan be represented by trigonometric fUllctions.We use the three tligoDometric f unctions found on a calculator: the sine, the cosine, and thetangent.
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