# How to define arc of definition?

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12 hours ago, DimaMazin said:

Draw unit circle x2+y2=1     Mark angle 166 degrees or 168 degrees .

I have used 168 degrees since this is actually divisible by 6.

The arc looks like semicircle, but is actually 168o.

Is joining the points as instructed supposed to create straight lines that all meet at one point?

How does this help define a  sine ?

And more particularly the sine of what angle?

It is clear you have several members interested in a  technical discussion about this so it is in your own interests to engage as fully as you can.

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Correct. Divide arc for infinite quantity of equal parts and divide its chord for infinite quantity of equal parts. Draw straight line through  nearest point of division of the arc  to middle of the a

It may be easier and more efficient if you also provide a picture? If each interested member have to interpret your description there is plenty of room for confusion?

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