Homework Help: Math Help Plz

Posted by Anonymous on Thursday, March 29, 2012 at 5:23pm.

The point (3,-8) is on the terminal arm of the angle x. Find sinx exactly and find x, in radians, to two decimal places.

I don't how I should start this question.

please help and thank you

Math Help Plz - Steve, Friday, March 30, 2012 at 10:23am
you know that tanθ = y/x = -8/3

Arctan(8/3) = 1.21
so, since we are in the 4th quadrant,

θ = -1.21

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