Дано:BC = 3 см∠B = 30°∠C = 90°
Найдем сторону AB:AB/sin(∠B) = BC/sin(∠C)AB/sin(30°) = 3/sin(90°)AB/0.5 = 3/1AB = 1.5 см
Теперь найдем ∠A:∠A = 180° - ∠B - ∠C∠A = 180° - 30° - 90°∠A = 60°
Итак, ∠A = 60°.
Дано:
BC = 3 см
∠B = 30°
∠C = 90°
Найдем сторону AB:
AB/sin(∠B) = BC/sin(∠C)
AB/sin(30°) = 3/sin(90°)
AB/0.5 = 3/1
AB = 1.5 см
Теперь найдем ∠A:
∠A = 180° - ∠B - ∠C
∠A = 180° - 30° - 90°
∠A = 60°
Итак, ∠A = 60°.