Answer:
80 degrees
Step-by-step explanation:
42^2=30^2+35^2-2(30)(35)cosx
1764=2125-(2100)(cosx)
-361= -2100cosx
-361/-2100=cosx
0.1719047619=cosx
cos^-1x=80.10141556
Round off to the nearest degree=80
Answer:
100 degrees
Step-by-step explanation:
30^2+35^2-2*30*35cos80
=42
180-80=100
