Đường tròn $(I;r)$ nội tiếp $\bigtriangleup ABC$ tiếp xúc với ba cạnh $AB;BC;CA$ lần lượt tại $M;N;P$.Chứng minh rằng: $S_{MNP}=(\frac{pr^{2}}{2R})$
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Đã gửi 28-11-2015 - 10:13
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I learned that each mistake was probably a reflection of something that I was (or others were) doing wrong, so if I could figure out what that was, I could learn how to be more effective. I learned that wrestling with my problems, mistakes, and weaknesses was the training that strengthened me. Also, I learned that it was the pain of this wrestling that made me and those around me appreciate our successes.
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