Угол при вершине, противолежащей основанию равнобедренного треугольника, равен 3...

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Угол при вершине, противолежащей основанию равнобедренного треугольника, равен 30°. Боковая сторона треугольника равна 45. Найдите площадь этого треугольника.

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dspdpdp Площадь треугольника равна половине произведения двух сторон на синус угла между ними.
То есть S=0,5×45×45×0,5 (sin30^)=506,25

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