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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
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Quote:
 Originally Posted by gixxerman1980 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
Your image doesn't seem to match up with the info you provided.

Quote:
 line EF is a section of a line that starts at -10249, 0 and ends at -10094.8, 7615.2
If point E has coordinates (-10249, 0) and point F is (-10094.8, 7615.2), then point F's x-coordinate should be less than -10249. Note -10094.8 > -10249

Quote:
 BTW, the angle at A is 91.16
What angle at A? The angle at the intersection of the tangent line and radius at point A is 90 degrees.

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: 19,982 Thanks: 1853 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: 2,781 Thanks: 1432 I'm not seeing the 75.52 degree angle by point D
August 19th, 2017, 10:18 PM   #8
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Quote:
 Originally Posted by gixxerman1980 Attachment 9099
Nothing is clear with this image.

Can you plot all the known points with origin point first, with their labels?, then try to sketch circle & angles.

 Tags calculating, coordinates, point, tangent

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