{"problem":{"name":"计算三角形面积","description":{"content":"平面上有一个三角形，它的三个顶点坐标分别为 $(x_1,y_1),(x_2,y_2),(x_3,y_3)$，那么请问这个三角形的面积是多少。","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":524288},"difficulty":{"LuoguStyle":"P1"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB2031"},"statements":[{"statement_type":"Markdown","content":"平面上有一个三角形，它的三个顶点坐标分别为 $(x_1,y_1),(x_2,y_2),(x_3,y_3)$，那么请问这个三角形的面积是多少。\n\n## Input\n\n输入仅一行，包括 $6$ 个双精度浮点数，分别对应 $x_1,y_1,x_2,y_2,x_3,y_3$。坐标的绝对值不超过 $100$，且小数点后最多只有一位。\n\n## Output\n\n输出也是一行，输出三角形的面积，精确到小数点后两位。\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2031","tags":["顺序结构"],"sample_group":[["0 0 4 0 0 3","6.00"]],"created_at":"2026-03-03 11:09:25"}}