(2/2)C的度数.

a/sinA=b/sinB=c/sinC=ksinA+sinB=√2sinCa+b=√2ca+b+c=√2+1c=1a+b=√2S=(1/2)absinC=(1/6)sinCab=1/3cosC=(a^2+b^2-c^2)/2ab=[(a+b)^2-2ab-c^2]/2ab=(2-1-2/3)/2*(1/3)=1/2C=60