Math help needed,,,,,,,,,,,,,,,,,,,,

in triangle ABC, a=7.8,b=4.2,and c=3.9. Find B
answer choices
a. 15.1 degrees
b. 148.7 degrees
c. 78.9 degrees
d. 16.2 degrees



exam 6 q24

c/a = sinB, assuming lower case letters are lengths.

so, B = sin -1(c/a)

AHHHCHOOO
LAW OF COOOOOOOSSINEs
c^2 = a^2 + b^2 -2abcos(C)
psssh i prolly told you to much :P