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August 18th, 2009, 07:01 AM  #1 
Newbie Joined: Aug 2009 Posts: 5 Thanks: 0  Rotate a line about a point
Hi I have a line with end points (x1,y1) and (x2,y2). If I rotate a line about the point (x3,y3) at an angle 'a', it wlll be parallel to x axis. At what angle should I rotate the line about another point (x4,y4), to make it parallel to the x axis? Is there any formula for calculating the angle for rotating the line about the point (x4,y4)? Manu 

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line, point, rotate 
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