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September 21st, 2017, 04:42 AM  #1 
Newbie Joined: Sep 2017 From: Lahore Posts: 4 Thanks: 0  Finding the factor with which length increases
I want to prove that if there is a change in angle, length in y changes with the factor: sec φ. A and B are points on curved surface, two lines are extended through origin to a line that is tangent to the circle, these points are A' and B', change in Angle will bring a change in length between A' and B'. I need to know how is this doable.maths (2).jpg 

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factor, finding, increases, length 
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