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Nesse desafio, os ângulos indicados são ângulos externos do triângulo. Como cada ângulo interno e seu respectivo externo são suplementares, cada ângulo interno pode ser escrito como 180° menos o valor do ângulo externo correspondente. Assim, os três ângulos internos do triângulo são: , e . Sabemos que a soma dos ângulos internos de qualquer triângulo é sempre 180°. Portanto: + + = 180 Somando os termos: 540 − 18x =
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