有下列说法:其中正确的个数是    (     )             

有下列说法:其中正确的个数是    (     )                                 

(1)有一个角为60°的等腰三角形是等边三角形;                               

(2)三角之比为3:4:5的三角形为直角三角形;

(3)等腰三角形的两条边长为2,4,则等腰三角形的周长为10;

(4)一边上的中线等于这边长的一半的三角形是直角三角形;

  A、2个        B、3个      C、4个     D、1个[

 

答案

B

解析:略

 

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