Предмет: Геометрия, автор: viktoriadevatirikova

Докажите ,что a||b (срочно помогите пожалуйста)

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Ответы

Автор ответа: CharlieMilnes

Ответ:

Берем угол 60° и <3

Т.к. c — прямая, 180-60=120°

<b=<c=120°

Угол b= углу с как накрест лежащие при прямых a и b и секущей c

Автор ответа: ivanovamaria2911

Ответ:

угол 60° вертикальный с углом 2,а значит они равны

угол 2 и угол 120° односторонние

тут уже по 3 признаки (односторонние углы дают в сумме 180 градусов) 60°+120°=180°

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