Originally Posted by

**tami-chan87** Hi, I'm taking the a Math placement test this Saturday so I've been practicing for that, but here's another problem I just can't figure out:

if sinθ= 5/13 and tanθ < 0

then secθ=

I know that sin = opposite/hypotenuse

therefore the opposite side is 5 and the hypotenuse is 13

I also know that sec = hypotenuse/ adjacent

I don't know how to get the adjacent. I've tried law of sines a/sinalpha = b/sinbeta but I only have on angle (sinθ=5/13 = 22,62 degrees ?)

Then I tried law of cosines, but same problem here, I don't have the angle opposite the side I'm looking for.

The answer is supposed to be -13/12.

Could anyone please give me a hint on how to get there?