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点 (0,0), (6,0), (3, 3\sqrt 3) 构成什么类型的三角形？（答：等边三角形，边长6。）
点 (0,0), (6,0), (3, 3\sqrt 3) 构成什么类型的三角形？（答：等边三角形，边长6。）
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