∡ICB ≡ ∡IBC => ΔIBC - isoscel =>
∡ICB ≡ ∡IBC = (180° - 130°) : 2 = 50 : 2 = 25°
BI - bisectoare => ∡B = 2·∡IBC = 2·25 = 50°
CI - bisectoare => ∡C = 2·∡ICB = 2·25 = 50°
∡A = 180° - 100° = 80°
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∡ICB ≡ ∡IBC => ΔIBC - isoscel =>
∡ICB ≡ ∡IBC = (180° - 130°) : 2 = 50 : 2 = 25°
BI - bisectoare => ∡B = 2·∡IBC = 2·25 = 50°
CI - bisectoare => ∡C = 2·∡ICB = 2·25 = 50°
∡A = 180° - 100° = 80°