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Question
if ( lp = 8 ), find ( lm ).
Step1: 重心性质
三角形重心是三角形三条中线的交点,重心到顶点的距离是它到对边中点距离的\(2\)倍。
Step2: 求\(LM\)
已知\(LP = 8\),因为\(M\)是\(JK\)中点,\(P\)是重心,所以\(LM\)被\(P\)分成\(2:1\)的两段。设\(LM=x\),则\(LP=\frac{2}{3}x\)。
由\(LP = 8\),即\(\frac{2}{3}x = 8\),解得\(x=12\)。
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\(12\)