Răspuns :
∡A + ∡C = 90° } => ∡A + 2∡A = 90° => 3∡A = 90° => ∡A = 30°
∡C = 2∡A
∡A = 30° =>T30° => AC = 2BC = 4 cm
AB = √AC² - BC² = √16 - 4 = √9 = 3 cm
A = AB·BC/2 = 3·2/2 = 6/2 = 3 cm²
∡A + ∡C = 90° } => ∡A + 2∡A = 90° => 3∡A = 90° => ∡A = 30°
∡C = 2∡A
∡A = 30° =>T30° => AC = 2BC = 4 cm
AB = √AC² - BC² = √16 - 4 = √9 = 3 cm
A = AB·BC/2 = 3·2/2 = 6/2 = 3 cm²