Question

In triangle ABC, c = 9 m/_B = 65° and a = 105. Find b.​

Answer 1

b = 101.52

Explanation:

b^2 = a^2 + c^2 - 2ac CosB

b^2 = 105^2 + 9^2 - 2(105)(9) Cos 65°

b^2 = 11 106 - 798.75

b^2 = 10 307.25

b = 101.52

Answer 2

Answer:101.52

Explanation:

Given

a=105

c=9

`B=65^(\circ)`

using cosine rule

`2acCosB=a^2+c^2-b^2`

`2(105)(9)Cos65=105^2+9^2-b^2`

`b^2=11025+81-798.7485`

b=101.524