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В треугольнике ABC проведена биссектриса AL, AL=LB, а угол B равен 23°. Найти угол C. помогите плиз!!!
Ответы 1
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ΔALB - равнобедренный, т.к. AL = LB, поэтому уг. ВАL = уг. В = 23гр.AL - биссектриса, поэтому уг. А = 2уг. BAL = 2·23 = 46гр.В ΔАВС уг.В = 23гр., уг А = 46гр., тогда уг.С = 180 - уг.А - уг.В = 180 - 23 - 46 = 111гр.Ответ: 111гр.
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Автор:
colemangentry - 5 лет назад
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