Respuesta :

bcalle
(20/Sin 67) = (21/Sin A)
Cross multiply
21Sin67 = 20SinA
Divide by 20
(21Sin67)/20 = SinA

A = Sin^-1 (21Sin67)/20 = 75 degrees
silentzmercy

Answer:

A = 75.1°, B = 37.9°, b = 13.3; A = 104.9°, B = 8.1°, b = 3.1