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August 19th, 2017, 08:17 AM  #1 
Newbie Joined: Aug 2017 From: Tulsa, OK Posts: 4 Thanks: 0  Need help calculating coordinates for a tangent point. So let's say I know coordinates for D (10171.62, 490.26) angle at that point is 75.52. Also, line EF is a section of a line that starts at 10249, 0 and ends at 10094.8, 7615.2. How do I find the coordinates for A? BTW, the angle at A is 91.16 Last edited by skipjack; August 19th, 2017 at 10:34 AM. 
August 19th, 2017, 08:52 AM  #2  
Math Team Joined: Jul 2011 From: Texas Posts: 2,700 Thanks: 1358  Quote:
Quote:
Quote:
I advise you to make a better sketch that fits your given information. Last edited by skipjack; August 19th, 2017 at 10:35 AM.  
August 19th, 2017, 09:21 AM  #3 
Newbie Joined: Aug 2017 From: Tulsa, OK Posts: 4 Thanks: 0 
Sorry, I found that image on google and thought it may be enough to show the point I'm trying to find coordinates for. I'll try to draw something that will be a little closer visually.

August 19th, 2017, 09:43 AM  #4 
Newbie Joined: Aug 2017 From: Tulsa, OK Posts: 4 Thanks: 0  Trig_Problem.jpg I know the drawing shows the known point on the circle looking more like it is at about 50 degrees, but I hope that is close enough. 
August 19th, 2017, 10:39 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 18,568 Thanks: 1483 
Can you label all relevant points (A, D, E, F, etc.) and mark the known angles?

August 19th, 2017, 10:51 AM  #6 
Newbie Joined: Aug 2017 From: Tulsa, OK Posts: 4 Thanks: 0  
August 19th, 2017, 11:20 AM  #7 
Math Team Joined: Jul 2011 From: Texas Posts: 2,700 Thanks: 1358 
I'm not seeing the 75.52 degree angle by point D 
August 19th, 2017, 10:18 PM  #8  
Senior Member Joined: Jun 2017 From: India Posts: 234 Thanks: 6  Quote: Can you plot all the known points with origin point first, with their labels?, then try to sketch circle & angles.  

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calculating, coordinates, point, tangent 
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