Tan∅=4/3
SohCahToa...
Sine=Opposite/Hypotenuse
Cosine=Adjacent/Hypotenuse
Tangent=Opposite/Adjacent
Opposite=4
Adjacent=3
BUT, since it's in the third quadrant, they're both negative.
Opposite=-4
Adjacent=-3
Solve for the hypotenuse.... (-4)²+(-3)²=c²
c=5
Sine=-4/5
Cosine=-3/5
Secant=-5/3
Cosecant=-5/4
Cotangent=3/4