Из точки а, удаленной на расстояние 5 см от плоскости, проведены к этой плоскости, наклонные ав и ас под углом 30 градусов к плоскости. найдите угол между наклонными,угол между проекциями, если вс=10 см.
293
375
Ответы на вопрос:
Получившийся треугольник будет являтся ранобедреннымего высота поделит основу пополам.из этого можно выделить прямоугольный треугольник,а затем найти гипотенузу и дальше используя теорему синусов посчитать угол: 1) найдем гипотенузу: 5/cos30° =5 × 2/√3 = 10/√32) по теореме синусов надем угол α между наклонными: ответ: sin√3/2 = 60° × 2 = 120°
At the beginning of the day, Margaret had 72 ice cream cones. By noon, she had $\frac{2}{3}$ as many cones as she had at the beginning of the day. By the end of the day, she only had $\frac{2}{3}$ as many cones as she had at noon. How many ice cream cones does she have at the end of the day?
Объяснение:
At the beginning of the day, Margaret had 72 ice cream cones. By noon, she had $\frac{2}{3}$ as many cones as she had at the beginning of the day. By the end of the day, she only had $\frac{2}{3}$ as many cones as she had at noon. How many ice cream cones does she have at the end of the day?
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