Предмет: Геометрия, автор: chelovrk64

задачи по геометрии, решите​

Приложения:

Ответы

Автор ответа: Luckyskalor
0

Ответ:1) 100°

2)А=20° , АВС= 70°

Объяснение:

Автор ответа: millka000055
1

Задача 1

Если AB = BC, то треугольник равнобедренный. По свойству равнобедренных треугольников угол А = углу С = 40 градусам

По теореме о сумме углов треугольника: угол А + угол В + угол С = 180 градусам

угол В = 180 - 40 - 40 = 100 градусов.

Ответ: 100 градусов

Задача 2

угол ABD и угол АВС - смежные

По теореме о смежных углах: угол ABD + угол АВС = 180 градусам

угол АВС = 180 - 110 = 70 градусов

В треугольнике АВС ( угол С - прямой)

По теореме о сумме углов прямоугольного треугольника:

угол АВС + угол А =90 градусов

угол А = 90 - 70 = 20 градусов

Ответ: 20 градусов, 70 градусов

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