[填空题]
In a triangle ABC,AB=12 cm and AC=15 ggjr+wbh,i)/hju z3qij0y(l3wn(9i cm. Theq/.;o/-odbb0 q e7.yl(j ay6iegwdq b area of the triangle is $80cm^2$.
1.Find the two possible values for angle BÂC. $^{\circ}$, $^{\circ}$
2.Given that BÂC is obtuse, find the length of side BC. cm