I'm trying to do a simple electric field due to point charges problem, but I'm stuck on a very simple detail. There are a number of point charges on an xy plane, and one of the point charges is at the cooridinate (1,-2). I need to figure out which angle a line drawn from this point to the origin would make with the x axis to do the problem, but can't figure it out! I'm sure as soon as someone tells me the answer I'll remember how to find it; it's just a simple geometry problem!:grumpy:(adsbygoogle = window.adsbygoogle || []).push({});

Can anyone help? I can do the rest of the problem, its just this one snag that has me held up.

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# Coordinate (1,-2), angle of intersection thru origin?

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