Question

Find angle B in the following triangle.
Answers,
39.6 degrees
40.4 degrees
41.9 degrees
42.5 degrees

Answer 1

Use the law of cosines.

Answer 2

How do i do that?

Answer 3

b^2= a^2+c^2-(2*a*c*cosB)

Answer 4

I got 41.9. Is that correct?

Answer 5

That's not what I got

Answer 6

what did you get? so i can work throught the problem and see where i messed up. Thanks

Answer 7

First, take the formula and plug in all known values, a, b, and c, and show it.

Answer 8

so you are given the side lengths. (a, b, c)

Answer 9

23,36,39

Answer 10

a = 36

Answer 11

Why don't you just plug in the numbers in the formula you have and show it.

Answer 12

b = 23

Answer 13

c = 29

Answer 14

so now plug in those values into the formula like Mathslover said :)

Answer 15

39.6?

Answer 16

correct

Answer 17

oooppss :/
@mathstudent55 i put like @mathslover on mistake...
sorry about that :(

Answer 18

Not your mistake, I am so famous :D

Answer 19

loll yeah its true ^

Answer 20

Really? I was joking, haha . :)

Answer 21

haha well you are quite famous (here on OS) and im sure anywhere else :) haha

Answer 22

but ur like famouz and smart!

Answer 23

:))