如果一个等腰三角形的两边长为3cm和6cm,则它的周长为         

如果一个等腰三角形的两边长为3cm和6cm,则它的周长为               

答案

15 cm解析:
当腰为3cm时,3+3=6,不能构成三角形,因此这种情况不成立.
当腰为6cm时,6-3<6<6+3,能构成三角形;
此时等腰三角形的周长为6+6+3=15cm

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