John Gabriel wrote: > On Sunday, 9 March 2014 15:54:52 UTC+2, Peter Percival wrote: > >> In "sin(x) is defined to be ...", x has to appear free in the "..." >> unless sin(x) is a constant. So what's the connection between >> opposite/hypotenuse and x? > > The connection is this: x is an angle and opposite/hypotenuse is the sine ratio for that angle. It's high school math.
How do you measure angle? The question I'm asking is not to be answered "in radians" or "in degrees", rather the problem is: given two line segments that cut one another, how do you assign a measure to either of the angles between them?
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