In triangle abc, a = 9, c = 5, and b = 120°. find b2. 61 83.5 128.5 151

The correct answer is 151.

Step-by-step explanation:

Given,

In triangle ABC,

BC = a = 9 unit,

AB = c = 5 unit,

m∠B = 120°,

We have to find : b² or AC²,

By the cosine law,

Hence, the value of is 151.

Option D)  

Step-by-step explanation:

We are given the following information in the question:

We have to find

The law of cosines state that if a, b and c are the sides of triangle and b is the side opposite to angle B, then,

Putting the values, we have,

Option D)

what

4

step-by-step explanation:

im pretty sure it's 4 beacsue 8/2 equals 4