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A+soma+dos+tr%C3%AAs+%C3%A2ngulos+internos+de+um+tri%C3%A2ngulo+%C3%A9+180.+Portanto%2C+o+terceiro+%C3%A2ngulo+mede+180 +%E2%80%93+%2890+%2B+30%29+%3D+60+graus.

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