Предмет: Алгебра, автор: checkas

Помогите решить два задания.

Приложения:

Ответы

Автор ответа: Creeper0k

1) BC=AD
AD - общая.
△CDA=△ABC => ∠B = ∠D
ч.т.д

2) Т.к △ABC - равнобедренный, ∠С = 50°
смежные углы → ∠DAB - ∠BAC = 180°-80°=100 °
AM - биссектриса ∠MAB=∠MAD => 100°:2=50°
∠MAB=∠ABC=50°

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