I'm working on a little html5 canvas experiment and I think my question is best described in an image (not to scale)...
I'm fairly certain I need to use trigonometry to solve this.. but I'm I'm not sure how. Please help.
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lower left coordinates should be
angle between the segment A and the y-axis ...
angle between the segment in quad I and the x-axis =
wow, thanks skeeter. I think I've got my head around that. I'll have a play and let you know.
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