Răspuns :
(AB) = (AC) => AB = AC => ΔABC = isoscel
(BC) = 100° => ∡A = (BC)/2 = 100°/2 = 50°
∡A + ∡B + ∡C = 180° } => ∡B + ∡C = 130° => ∡B = ∡C = 130°/2 = 65°
∡A = 50° ∡B = ∡C
(AB) = (AC) => AB = AC => ΔABC = isoscel
(BC) = 100° => ∡A = (BC)/2 = 100°/2 = 50°
∡A + ∡B + ∡C = 180° } => ∡B + ∡C = 130° => ∡B = ∡C = 130°/2 = 65°
∡A = 50° ∡B = ∡C