由于上面不够写,所以问题在下面.奥数题：The coordinates of the three points A,B,C on the piane are (-5,-5),(-2,-1)and(-1,-2),respectively,the triangle ABC is( ).A.a right triangle B.an isosceles C.an equilateral triangle D.an obtu
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由于上面不够写,所以问题在下面.奥数题：The coordinates of the three points A,B,C on the piane are (-5,-5),(-2,-1)and(-1,-2),respectively,the triangle ABC is( ).A.a right triangle B.an isosceles C.an equilateral triangle D.an obtu
由于上面不够写,所以问题在下面.
奥数题：The coordinates of the three points A,B,C on the piane are (-5,-5),(-2,-1)and(-1,-2),respectively,the triangle ABC is( ).
A.a right triangle B.an isosceles C.an equilateral triangle
D.an obtuse triangle
请帮忙翻译一下,并告诉我如何解答这道题（写出过程）
由于上面不够写,所以问题在下面.奥数题：The coordinates of the three points A,B,C on the piane are (-5,-5),(-2,-1)and(-1,-2),respectively,the triangle ABC is( ).A.a right triangle B.an isosceles C.an equilateral triangle D.an obtu
坐标三个点A,B,C在皮亚内是（-5,-5）,（-2,-1）和（-1,-2）,分别是三角形ABC（）.
a.等腰直角三角形B. 等腰C.等边三角形
D.an钝角三角形
答案B