• Title/Summary/Keyword: Radius of inscribed angle

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A Study on Various Proofs of Equality $\frac{1}{h_a}+\frac{1}{h_b}+\frac{1}{h_c}=\frac{1}{r}$ (등식 $\frac{1}{h_a}+\frac{1}{h_b}+\frac{1}{h_c}=\frac{1}{r}$의 다양한 증명방법에 대한 연구)

  • Lee, Jae-Kab;Han, In-Ki
    • Journal of the Korean School Mathematics Society
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    • v.10 no.4
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    • pp.519-533
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    • 2007

  • In this paper we study a equality $\frac{1}{h_a}+\frac{1}{h_b}+\frac{1}{h_c}=\frac{1}{r}$ which contains altitudes and radius of inscribed circle of triangle. We search some paths for proving the equality, and find out 9 proof method of the equality which is related with descriptive geometry, coordinate geometry, and vector geometry.

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