My Math Forum Finding the factor with which length increases

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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 do-able.maths (2).jpg
 September 21st, 2017, 06:18 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,302 Thanks: 1971 The reply here gives what can be done.

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