in triangle BCD, find the value of angle B, if b = 41 cm, c = 65 cm, and d = 52 cm.

Answer 1

The Law of Cosines:

CosB = (-b^2 + c^2 + d^2)/2cd.
cosB=(-1681 + 4225 + 2704)/6760=0.77633
B== 39.1o