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Un teorema sul triangolo rettangolo. - MaRDI portal

Un teorema sul triangolo rettangolo. (Q2578229)

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Un teorema sul triangolo rettangolo.
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    Un teorema sul triangolo rettangolo. (English)
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    Im rechtwinkligen Dreieck ist bekanntlich \(p = 2R + r\) (\(R\) Umkreishalbmesser, \(r\) Inkreishalbmesser, \(p\) der halbe Umfang). Verf. beweist trigonometrisch die Umkehrung: Ein Dreieck, in dem \(p = 2R + r\) ist, ist rechtwinklig.
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