Question 931498

{{{240}}} is in quadrant III
In quadrants III and IV  {{{sin (theta)}}} will be negative.

{{{240}}} is {{{60}}} more than {{{180}}}, so {{{240}}}in III quadr. is same as {{{60}}} in I quadrant, just has negative sign

{{{sin(60)= sqrt(3)/2}}}, and

{{{sin(240)=-sqrt(3)/2}}}