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I am working on a simple force problem involving inclines. I found a reference of $48^\circ$, in the third quadrant; now, to find the obtuse angle, do I subtract that value from $270^\circ$, or do I add it to $180^\circ$?

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I've just done an edit changing $48^{~o}$ to $48^\circ$ (and similarly with the other angles). TeX is not so crude. – Michael Hardy Nov 14 '12 at 17:06
This is a matter that depends on the definitions used inn this particular problem. – dmckee♦ Nov 15 '12 at 18:03

closed as too localized by Qmechanic♦, dmckee♦ Nov 15 '12 at 18:02

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I think a diagram or slightly clearer rephrasing of the question is in order, but I think you want to do $180^{\circ} - \theta$ where $\theta$ is the angle you have found.

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