Предмет: Геометрия, автор: Racconlovemoney

Кто может помочь
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Автор ответа: Nennn

0

Т.к. два угла в треугольнике BDC известны, найдем третий. Сумма углов в треугольнике равна 180 градусам. Значит,∠BCD=60. Все три угла в треугольнике равны 60 градусам ⇒ треугольник равносторонний⇒CD=2.
В параллелограмме все стороны равны 2, периметр ABCD равен 2*4=8.
Ответ:8.

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