Determine tan(t) if cos(t)= -3/5 and sin(t) > 0

now, the hypotenuse is just a radius unit, so, is never negative, so, the fraction is negative because the numerator is negative, that is, the adjacent side is -3.

now, let's use the pythagorean theorem to find the opposite side.



ok... so, which is it? the +/-?   well, we also know that sin(t) >0, namely that the sine of the angle is positive, so, then  is +4 then.

Arhombus is a quadrilateral.