Question

Suppose, for each triangle in the diagram, the measurements that are labeled are known, while the other measurements are unknown. In which triangle can you directly substitute known values into the Law of Cosines to find an unknown side or angle? ∆ABC
∆DEF
∆XYZ
∆PQR
∆JKL

Answer 1

im thinking its either the 3rd one or last one ?

Answer 2

@peachpi

Answer 3

cant open the pic file

Answer 4

hmm one second

Answer 5

http://contentlaunch.ple.platoweb.com/testimagedb/a1/a1ea84031b29c21f5618af16a32f270c

Answer 6

try that

Answer 7

nope. try taking a screenshot and uploading it a a png

Answer 8

sorry, can't get it opened.
For law of cosines you either need to know
- all 3 sides or
- 2 sides and the angle for the side you don't know

Answer 9

the one with 3 sides pqr