Respuesta :

m∠С = 180 - m∠A - m∠B = 180 - 72 - 16 = 92°

You can solve it using the law of sines:

[tex] \cfrac{a}{sinA}= \cfrac{c}{sinC} \ \ \ \to \\\\\\ a= \cfrac{c*sinA}{sinC} = \cfrac{61*sin72^o}{sin92^o}= \cfrac{61*0.951}{0.9994}\approx58.0[/tex]