December 2019 1 107 Report
Na figura que segue, os triângulos ABC e BDC são isósceles de base BC¯. Além disso, BAC^=80∘, o segmento de reta BD¯ bissecciona o ângulo ABC^ e o segmento de reta CD¯ bissecciona o ângulo ACB^. A medida do ângulo BDC^ é igual a:

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