If , , ; Find the angles A, B and C. Give your answer in degrees to at least 3 decimal places.
A=?
B=?
C=?
Hello, qbkr21!
Given three sides of a triangle, you need the Law of Cosines.
You should be able to start with: .
. . and write it in the form: .
If , find the angles
Give your answer in degrees to at least 3 decimal places.
To find angle , use: .
. . We have: .
. . Hence: .
. . Therefore: .
To find angle , use: .
. . We have: .
. . Hence: .
. . Therefore: .
To find angle , subtract and from **
. . Therefore: .
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
** That is, if you trust your answers for and
To check, we can find with: .
We have: .
Then: . . . . close enough!