Предмет: Геометрия, автор: alinakhomenko2008

Срочноооо пожалуйстаааа!!!!

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Автор ответа: ludmilaksenija2005
1

Объяснение:

1

Внешний угол треугольника равен сумме двух оставшихся углов не смежных с этим внешним углом :

<В+<С=<КАВ

<В=4х

<С=5х

4х+5х=135

9х=135

Х=135:9

Х=15

<В=4×15=60 градусов

<С=5×15=75 градусов

2

<А=<С, значит АВ=ВС. Тр-к АВС равнобедренный

<А=<С=(180-<В):2=(180-80):2=50 градусов

<КАС=<ВАК=<А:2=50:2=25 градусов

<АКС=180-<КАС-<С=180-25-50=105 градусов

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