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math challenge II-A geometry 5.27

 
 
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回复: Re: math challenge II-A geometry 5.27
by Zeyin Wu - Thursday, 21 October 2021, 7:01 PM
 

Thanks! I now understand. line BC has slope -b/c and it intersects the altitude of A, the two lines are perpendicular so the slope of A's altitude is cx/b.