∠BAC=30° ∠BCA=30° ∠ABC=120°
Объяснение:
т.к. BD⊥AC то Δ ADB -прямоугольный BD=AB/2 ⇒ ∠BAC=30°
(в прямоугольном треугольнике катет, лежащий против угла в 30° равен половине гипотенузы)
Δ АВС-равнобедренный ∠ВАС=∠ВСА ⇒ ∠ВСА=30°
∠АВС=180°-2∠ВАС ∠АВС=180°-2·30°=120°
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Must Waste More Time...
<ВАС=30°
<АВС=120°
<ВСА=30°
Объяснение:
треугольник ADB:
<D=90°
25,2:12,8=2, гипотенуза в 2 раза больше катета
=> <ВАС=30°. тк треугольник АВС равнобедренный, то <ВСА=30°
180°-2×30°=120°
<АВС=120°