Question

Write an equation that could be used to find the value of b.
http://curriculum.kcdistancelearning.com/courses/GEOMx-HS-A09/b/assessments/R-LawsofSinesandLawofCosinesQuiz/Geometry_8.4_Quiz_FINAL_20q.png

Answer 1

@marissalovescats it's b2 = 132 + 122 – 2(13)(12)(cos 14°) right?

Answer 2

Yes except it's cos 41 not 14

Answer 3

And 13^2 is 169 not 132

Answer 4

b2 = 122 + 132 – 2(12)(13)(cos 41°)

b2 = 412 + 132 – 2(41)(13)(cos 12°)

b2 = 132 + 122 – 2(13)(12)(cos 14°)

b2 = 122 + 132 + 2(12)(13)(cos 41°)

Answer 5

which one?

Answer 6

Are these really your answer choices?

Answer 7

yeah they are...

Answer 8

oh wait sorry hold on...

Answer 9

b^2 = 12^2 + 13^2 – 2(12)(13)(cos 41°)

b^2 = 41^2 + 13^2 – 2(41)(13)(cos 12°)

b^2 = 13^2 + 12^2 – 2(13)(12)(cos 14°)

b^2 = 12^2 + 13^2 + 2(12)(13)(cos 41°)

Answer 10

b^2=a^+c^2-2(a)(c)CosB

b^2=12^2+13^2-2(12)(13)Cos41

b^2=144+169-2(12)(13)Cos41

That what it should be... but it would have to be the 1st one I guess

Answer 11

b^2 = 12^2 + 13^2 – 2(12)(13)(cos 41°) ?

Answer 12

Yes

Answer 13

thank you! :D

Answer 14

Thats why I was confused I was like 122 and 132??? Where are they getting that from? Lol

Answer 15

yeah haha i didn't notice that lol

Answer 16

That's okay haha