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Para descobrir o ângulo que está faltando, dá para transformar a figura em algo muito mais simples. As duas retas são paralelas, então podemos traçar uma linha perpendicular a ambas, ligando os dois lados inclinados. Isso transforma a figura em um pentágono, cujo interior inclui exatamente os ângulos que aparecem no desenho. Dentro desse pentágono, surgem dois ângulos de 90° formados pela perpendicular com cada uma das paralelas. Somando esses dois, já temos 180°. Agora somamos os outros ângul
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