英语翻译The coordinates of the three points A,B,C on the plane a

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英语翻译
The coordinates of the three points A,B,C on the plane are (-5,-5),(-2,-1) and (-1,-2),respectively,the triangle ABC is ( )
A、a right triangle B、an isosceles triangle C、an equilateral triangle D、an obtuse triangle

平面坐标系上有三点A,B,C,分别为(-5,-5),(-2,-1) 和 (-1,-2),三角形ABC是（B）
A、直角三角形B、等腰三角形C、等边三角形D钝角三角形
∴AB=5,AC=5,BC=√2

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