If sin theta = -0.7660, which of the following represents an approximate value of tan theta, for 180 degrees < theta < 270 degrees?

We have that
sin ∅=-0.7660

the sin ∅ is negative
so 
∅ belong to the III or IV quadrant
but
180°< ∅ < 270°
hence
∅ belong to the III quadrant
sin ∅=-0.7660
sin² ∅+cos² ∅=1
cos² ∅=1-sin² ∅> cos² ∅=1-(0.7660)²> 0.4132
cos ∅=√0.4132> cos ∅=0.6428
the value of cos ∅ is negative> III quadrant
cos ∅=-0.6428

tan ∅=sin ∅/ cos ∅> tan ∅=-0.7660/-0.6428> tan ∅=1.1917

the answer is
tan ∅ is 1.1917