Respuesta :

Answer:

Step-by-step 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)

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