1)triangleABC:angleA=155degrees,b=2,c=7
find angleB, angleC,and side a
i hope this explains enough if not tell me i have more questions but i need to know if you understand me.
Always gotta have a picture.
Use the Law of Cosines. Start with:
$\displaystyle a^2 = b^2 + c^2 - 2bc Cos A$
Plug in what we have: $\displaystyle a^2 = 2^2 + 7^2 - 2(2)(7) Cos 155$
Find an approximate answer. Round as necessary.
From there you could use the Law of Sines twice for the other two angles.