Answer:
Step-by-step explanation:
We are given three information about a triangle
angle A = 74°, a = 126, and b = 84
we can use the sine law to find the angle B
It is
[tex]sin B =\frac{b}{a}sin A[/tex]
so plugging all the known values we get
[tex]sin B = \frac{84}{126}sin(74)[/tex]
[tex]sin B =0.64084[/tex]
[tex]B= sin^{-1}(0.64084)[/tex]
B =39.85
so it rounds to
angle B =39.9°
Option A
