Explicaê

01

 Na figura a seguir  top enclose A C end enclose space approximately equal to space stack C B with bar on top space approximately equal to stack D B with bar on top space e space C A with hat on top B space equals space 30 º

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O ângulo x mede:

Desconsiderar opção Created with Sketch. Considerar opção Created with Sketch.
Desconsiderar opção Created with Sketch. Considerar opção Created with Sketch.
Desconsiderar opção Created with Sketch. Considerar opção Created with Sketch.
Desconsiderar opção Created with Sketch. Considerar opção Created with Sketch.