Question

Where did I go wrong?

Answer 1

b^2 = a^2 + c^2 - 2ac*cos(B)
45^2 = 38^2 + 48^2 - 2*38*48*cos(B)
2025 = 1444 + 2304 - 3648*cos(B)
2025 - 1444 - 2304 = -3648*cos(B)
-1723 = -3648*cos(B)
cos(B) = (-1723)/(-3648)
cos(B) =~ 0.47231359649122807017543859649123
cos(B) =~ 0.5

Answer 2

and then u do\[B = \cos^{-1} (0.472313.....)\]
= 61.8

Answer 3

u just didnt do the last step..thast it!

Answer 4

Got it. Thank you.