September 28th, 2018, 08:00 AM  #1 
Member Joined: Sep 2014 From: Sweden Posts: 94 Thanks: 0  Find ellipse sector line length? So if I know a and b of the ellipse and also the angle of it. How can I calculate the curved line from the point of b to the point of a? I want the length of the curved line. For example: In a circle you can calculate the circle sector by knowing the angle and the radius.. If possible using a, b and the angle of the ellipse. How can you calculate the same thing for an ellipse? 
September 28th, 2018, 09:06 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,282 Thanks: 931  
September 28th, 2018, 12:15 PM  #3 
Member Joined: Sep 2014 From: Sweden Posts: 94 Thanks: 0 
So is it r1 + r2 = 2a that I should use to get the length of the curved line? I don't find the article clear about what gives me the curved lines length? 

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ellipse, find, length, line, sector 
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