翻译：在直角坐标系中三角型A,B,C,3点坐标为（-5,-5）,（-2,-1）,（-1,-2）,那么三角型ABC是（ B ）
A.一个直角三角形 B.一个等腰三角形
C.一个锐角三角形（这个不清楚,楼主你打错了英文,我是猜的）D.钝角三角型
一道英语奥数题The coordinates of the three points A,B,C on the plan
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