Предмет: Геометрия, автор: SIMA1414

В равнобедренном треугольнике боковая сторона равна 10, а угол, лежащий напротив основания, равен 120°. Найдите площадь треугольника.

Ответы

Автор ответа: Аноним

1

S=1/2·a·b·sinα
a,b стороны треугольника
α-угол между ними
S=1/2·10·10·sin120⁰=50·sin(180-60)=50·sin60=50·√3/2=25√3

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