Cosine rule:
c^2=a^2+b^2-2abcosC=5.6^2+8.5^2-2*5.6*8.5cos80=31.36+72.25-95.2cos80=87.0787.
So c=9.33cm.
Sine rule:
sinA/a=sinB/b=sinC/c=sin80/9.33=0.1055.
sinA=0.1055*5.6=0.5910, A=36.23 degrees.
B=180-(80+36.23)=63.77 degrees.
So we have all sides and angles.