Question 1027220
<pre>
The law of cosines solved for the cosine is

{{{cos(B)=(a^2+c^2-b^2)/(2ac)}}}

Substitute:

{{{cos(B)=(22.5^2+13.6^2-18^2)/(2(22.5)(13.6))}}}

{{{cos(B)=0.6000163399}}}

{{{B="53.13°"}}}

The formula for C is

{{{cos(C)=(a^2+b^2-c^2)/(2ab)}}}

You do that one.

Edwin</pre>