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 Triginometry Help

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agentbaiter
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Joined: 22 Feb 2009
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PostPosted: Fri Mar 13, 2009 10:49 am Reply with quoteBack to top

Hey I'm creating an application for my University Final Major Project.

Im having a slight problem with trigonometry. I need to calculate the x,y coordinates of a point with only the angle and the distance from the origin.

Ive been reading up on trig to see if I can figure it out but it just wont come to me. Does anyone here know the equations I would need to use?

Any help would be extremely appreciated.
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Roycropper
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PostPosted: Fri Mar 13, 2009 11:05 am Reply with quoteBack to top

From memory (back when dinosaurs ruled the earth) the tangent of an angle in a right angled triangle is the opposite side divided by the adjacent side, wont they be y and x?


Image

Try here:

http://en.wikipedia.org/wiki/Trigonometric_functions

ETA: Shoot, you only have the angle & the hypotenuse, but the answers there somewhere, try a bit of Pythagorus. (SP?)

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Last edited by Roycropper on Fri Mar 13, 2009 11:09 am; edited 1 time in total
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wokabo
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PostPosted: Fri Mar 13, 2009 11:08 am Reply with quoteBack to top

x = d * cos (a)
y = d * sin (a)


Code:


y-----   
|    /|
|   / |
|  /d |
| /   |
|/a   |
+-----x


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agentbaiter
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PostPosted: Fri Mar 13, 2009 11:30 am Reply with quoteBack to top

You guys are immense thank you very much. My brain can slowly descamble now Razz
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YeaWhatever
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PostPosted: Sat Mar 14, 2009 12:48 am Reply with quoteBack to top

Also, try this. http://www.clarku.edu/~djoyce/trig/tangents.html

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