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
\(sin B =\frac{b}{a}sin A\)
so plugging all the known values we get
\(sin B = \frac{84}{126}sin(74)\)
\(sin B =0.64084\)
\(B= sin^{-1}(0.64084)\)
B =39.85
so it rounds to
angle B =39.9°
Option A
