AB/sinC=AC/sinBAC=sinB*AB/sinC=√2/2*√2/1/2=2∠A=180-(∠B+∠C)S△ABC=1/2*AC*ABsin∠A=1/2*2*√2*sin(∠B+∠C)=√2sin(30+45)=√2(sin30cos45+cos30sin45)=√2(1/2*√2/2+√3/2*√2/2)=1/2+√3/2