Why is Trigonometry used in so many applications that have nothing to do with triangles?
In: Mathematics
Because while initially trigonometry started off by using circles, we started defining it more generally using a unit circle. The x coordinate of a point on a unit circle is the cos and y coordinate is the sine. Since circles are the basis of the polar coordinate system, the math gets carried on too.
That’s one of the simple ways to explain it.
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