Question

What The length of AC?

Answer 1

A= 42 ° . 180- 138= 42. You get 138 from adding the angles given together (85+53)

Answer 2

If Angle C is 53° then angle A=42°

sin 42°/85=sin 85°/AC
==>AC=sin 85° *85 /sin 42°=126.54711....