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- Thread starter Luke77
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tiny-tim

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Why are reference angles necessary in trigonometry.

Apparently, they're the difference between the angle and the nearest multiple of 180° (π).

(so they're always between 0° and 90°)

In other words, trig tables only give you measurements up to 90°, so you find the "reference angle", look up the trig of

(see http://www.mathwarehouse.com/trigonometry/reference-angle/finding-reference-angle.php for some examples)

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CWatters

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HallsofIvy

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Thanks!

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