Предмет: Геометрия, автор: Keksuc

В треугольнике ABC: AB

Ответы

Автор ответа: Аноним
0
180-(120+40)=20°
ответ: 20°
сумма углов треугольника равна 180°. поэтому, чтобы найти угол , нужно от 180 отнять сумму остальных двух углов.
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