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等腰三角形边长公式
更新时间: 2021-05-25 07:33:39  

1、在任何一个三角形中,任意一边的平方等于另外两边的平方和减去这两边的2倍乘以它们夹角的余弦 几何语言:在△ABC中,a2=b2+c2-2bc×cosA 此定理可以变形为:cosA=(b2+c2-a2)÷2bc

2、两底角相等;顶角的角平分线、底边的中线和高互相重合;当腰长等于底边长时,则底角和顶角为6。

关键词: 等腰 三角形 公式

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