C
一般的三角形面积公式是 a*b*sinc （两邻边一夹角）
当这个三角形是直角三角形时 sinc最大,为1,所以面积最大是7*10/2,当他是直角三角形时.
一道SAT数学,06年的真题.What is the greatest possible area of a trian
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