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Hello again! 

I thought it would also be helpful to ask about this question also, despite posting a question earlier, since these are the two most troublesome for me. Here's the screenshot:

Thank you so much in advance. It really means alot to me what all you guys do. It just makes my day to know that people like you are out there doing such a service to those of us who are having trouble. It means the world. Thanks again!

Guest Oct 5, 2018

Best Answer 

 #1
avatar+537 
+2

\\S**t, I type my answer then I pressed "post new answer", then all my work gone.

Anyway, denote point (0.62200155,0.78301601) as point B and (0,1) as point A and center point O. connect point A and O,point B and point O.

The length of major arc AB is r*\(\Theta \) where r=1 since it is a unit circle and  \(\Theta \) =asin(y/r)=asin(0.78301601)

r*\(\Theta \)=1*asin(0.78301601)=0.89950000524

you can also verify this with acos=(x/r)

See the following link for visualization:

https://www.desmos.com/calculator/wndlgrvelg

cool

fiora  Oct 5, 2018
 #1
avatar+537 
+2
Best Answer

\\S**t, I type my answer then I pressed "post new answer", then all my work gone.

Anyway, denote point (0.62200155,0.78301601) as point B and (0,1) as point A and center point O. connect point A and O,point B and point O.

The length of major arc AB is r*\(\Theta \) where r=1 since it is a unit circle and  \(\Theta \) =asin(y/r)=asin(0.78301601)

r*\(\Theta \)=1*asin(0.78301601)=0.89950000524

you can also verify this with acos=(x/r)

See the following link for visualization:

https://www.desmos.com/calculator/wndlgrvelg

cool

fiora  Oct 5, 2018

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