Question

Can you use the Law of Cosines in the triangle below? Why or why not?

http://curriculum.kcdistancelearning.com/courses/GEOMx-HS-A09/b/assessments/R-LawofCosinesShortAnswerQuiz/Geometry_8.4.14_Quiz_FINAL_4q.gif

Answer 1

what are you trying to find?

Answer 2

if you can use the law of cosines

Answer 3

i said yes cuz all sides are given

Answer 4

there must be one included angle. that's why you cannot use Law of sin or cosin on the given problem

Answer 5

because no angle is given.

Answer 6

the law of sines requires an angle. it seems to me that an angle is not required for a COsines

Answer 7

here is Law cosines
\[\Large c^2=a^2+b^2-2abcos(\lambda) \]

where is \[\lambda \] is the angle opposite to side of length c

Answer 8

ahhh i see

Answer 9

one angle is required in Law of cosines as well .