Answer:
Explanation:
sum of ngles of triangle=180
90+39+A=180
129+a=180
A=180-129
A= 51
apply the some rule:
since 39 = opp/hyp
sin39=16/c
c= 16/sin39 = 25.42 ≅ 25.4 rounded to the nearest tenth
sin 51 = opp/hyp
sin51=a/25.42415166
a=19.8 ( rounded to the nearest tenth)