Предмет: Геометрия, автор: amazinglina33

помогите пожалуйста !!

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Автор ответа: cvb115

0

Ответ:

Так как треугольник DFC равнобедренный (DE=CE) ⇒

∠FEC=∠DEC/2=13/2=6.5°

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