Math (Vectors)

Consider the vector v=-5.7i-7.2j
Approximate to the nearest tenth of degree the angle vector v makes with the positive horizontal direction?

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1. theta=arcTan(7.2/5.7) and since it is in the third quadrant,
theta=arctan(7.2/5.7) + 180 degrees

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2. Thanks for the help! I wanted to ask how did you know that we're supposed to divide (7.2/5.7) and not the other way around?

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posted by Ray
3. if the angle A is drawn in the standard position, tan(A) = y/x

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posted by Steve

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