Предмет: Геометрия, автор: viktoriam045

Решите Прошу!!!!! Буду очень благодарен

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Автор ответа: LN330068

1

Ответ:

Продолжим параллельные АВ и СD

<1=<2=120*,как накрест лежащие

<3=<4=150*,как накрест лежащие
<5+<3=180*,как Смежные

<5=180-150=30*
<2+<6=180*,как Смежные

<6=180-120=60*
Треугольник МКС

Сумма всех углов треугольника 180*
<7=180-(30+60)=90*
<7=<8=90*,как вертикальные

<10=<9=(360-90•2):2=90*
<АОС=90*

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