Предмет: Геометрия, автор: Enzan

биссектриса угла а треугольника авс пересекает биссектрису cl в точке о, угол aol равен 25. найти градусную меру угла авс

Ответы

Автор ответа: tanya2512

<AOL является внешним углом ΔАОС, значит <AOL =<ОАС +<ОСА
По условию <A=2<ОАС и <С=2<ОСА
<АВС=180-<А-<С=180-2<ОАС -2<ОСА=180-2(<ОАС+<ОСА)=180-2*25=130°

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