Question 943816

if {{{BC=12}}} units long, side {{{AC=15}}} units long, and angle < {{{C =60}}} degrees, then we have

pay attention to the question:  what is side {{{AB-squared}}}?

{{{(AB)^2 = 15^2 + 12^2 - 2(15)(12)cos(60)}}}.....{{{cos(60)=1/2}}}


{{{(AB)^2 = 225 + 144 - 360*(1/2)}}}


{{{(AB)^2 = 369 - 180}}}


{{{(AB)^2 = 189}}} => this is {{{AB-squared}}}


so, your answer is: C. {{{189}}}