Mute
Com.Ciência.Gaia
Vamos organizar o raciocínio passo a passo, com calma, só usando relações de ângulos. No triângulo isósceles de cima, o ângulo do vértice mede 40°. A soma dos ângulos internos de um triângulo é 180°, então sobram 140° para os outros dois ângulos. Como eles são congruentes, cada um mede 70°. Agora observe o ângulo de 70° do lado esquerdo. O ângulo externo adjacente a ele não é complementar, e sim suplementar, porque juntos formam uma linha reta. Ângulos suplementares somam 180°, então esse ângu
Follow
41
1
17
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