Question 1186339
If you can find measure of angle C, then you can use that with already given angle at angle B  (74 degree), to solve for angle measure at A.  Law Of Sines.



<s>You only found measure of angle C, so you need to continue </s>for measure of angle A.  
{{{A+74+28.73=180}}}
{{{highlight(A=77.27)}}}