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В равнобедренном треугольнике АВС с основанием АВ cos ∠В=0,8, боковая сторона = 20см. Найдите АВ и высоту, проведенную к основанию.
Ответы 1
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Обозначим высоту проведённую к основанию как CH, тогда из прямоугольного треугольника CBH найдём BH:CosB = BH : BC отсюда BH = BC * CosB = 20 * 0,8 = 16 смAB = 2* BH = 32 смCH² = BC² - BH² = 20² - 16² = 400 - 256 = 144CH = 12 см
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Автор:
edward34 - 6 лет назад
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My parents always said I was born to be a sportsman. They said that even when I was in nappies, I wasn't happy unless I was kicking or throwing a ball. My first memory is of Dad and me playing football in our back garden. I recall my mum sitting down on the grass cheering me on as I clumsily kicked a football into the goal net my dad was 'defending'. The sense of achievement when I scored my first goal stuck with me, and my life has revolved around football ever since. As I grew up, I dreamed of becoming a football player. During class, I tried to stay focused on my studies; I knew that few people became professional sportsmen and it was crucial to get a good education. But I devoted every spare second to my passion. I knew that if I wanted to become a success, I would have to put all my energy into the game.
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