Предмет: Геометрия, автор: busurmanova0337

3. Используя теорему о внешнем угле треугольника, найдите внутренние углы треугольника.

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Ответы

Автор ответа: AvA22022

1

Ответ:

см ниже

Объяснение:

по теореме о внешнем угле, он равен сумме двух несмежных с ним углов, то есть , х+х+20=130. то есть 2х= 110. х=55. х это угол В. угол А= угол В+20 (по условию) = 55+20=75

ну и третий угол (С) можно найти разными способами. например, 180-внешний угол =180-130=50

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