(1)如图所示,A 1B 1C 1即为所求作的三角形,
点A 1(﹣1,2),B 1(﹣3,﹣5),C 1(5,0);
(2)S △ABC=8×7﹣
×2×7﹣
×8×5﹣
×2×6=56﹣7﹣20﹣6=56﹣33=23.