如下图所示，已知△ABC是直角三角形，且∠A=90°．则在下列各结论中

如下图所示，已知△ABC是直角三角形，且∠A=90°．则在下列各结论中，正确的结论个数为（）

①|

|=|

|②|

|=|

|③|

|=|

|④|

|²+|

|²=|

|²

A．4个 B．3个 C．2个 D．1个



答案

答案：B

解析：|+|=||=||，|+|=||=||，故②③正确，①错，又④为真，故选B.

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