Respuesta :
sen B = 280/415 = 0.6747 B = arc sen 0.6747 = 42° 25′
C = 90° - 42° 25′ = 47° 35′
c = a cos B c = 415 · 0.7381 = 306. 31 m
C = 90° - 42° 25′ = 47° 35′
c = a cos B c = 415 · 0.7381 = 306. 31 m