Предмет: Геометрия, автор: lizakrutiha

Буду благодарна если поможете пожалуйста

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Автор ответа: experced

Т.к. AB = BC(по условию), то ΔABC - равнобедренный.
Т.к. ΔABC - равнобедренный, то ∠A = ∠C(по свойству равнобедренных треугольников)

В треугольнике сумма всех углов равна 180°(по определению)

Теперь найдем ∠B:

$\angle B=180а-77а\times2=26а$

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