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13. : , , , , , .. , ́ (. 1) AE, CF, AI, CI = a, EB BF [] r. , BI AC; , B I = [ (a + r) 2 − a 2 ] {\displaystyle {BI}={\sqrt {{[}({a}+{r})^{2}-{a}^{2}{]}}}}. AD, DC, AB, BC , ADC = ~ ABC; BI = DI; B D = 2 [ (a + r) 2 − a 2 ] {\displaystyle {BD}=2{\sqrt {{[}({a}+{r})^{2}-{a}^{2}{]}}}} = A C. p , = 1; = p = [ (a + r) 2 − a 2 ] {\displaystyle {p}={\sqrt {{[}({a}+{r})^{2}-{a}^{2}{]}}}}. , , , A C = a − e = r. , , BD = B D = 2 [ (a − e + r) 2 − (a − e) 2 ] {\displaystyle {BD}=2{\sqrt {{[}({a}-{e}+{r})^{2}-({a}-{e})^{2}{]}}}} = , = p [(a − e + r)² − (a − e)²]; , ́ = p [(a + r)² − a ²] p [(a − e + r)² − (a − e)²] = (a + r)² − a ² (a − e + r)² − (a − e)² = r + 2 a r + 2(a − e). ́ ; , , ; , .
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