Question

In a triangle ABC, a=11, b=5 and c=30°. Use the law of cosines to determine side c.

Answer 1

\[\Large\bf\sf c^2\quad=\quad a^2+b^2-2ab \cos\mathscr C\]

Answer 2

Just need to plug some stuff in, yes?

Answer 3

\[\Large\bf\sf c\quad=\quad \sqrt{11^2+5^2-2(11)(5)\cos30^o}\]