December 2019 1 89 Report
Na figura abaixo, a circunferência de centro O e raio 8 circunscreve o triângulo isósceles ABC, com AB=AC. A altura de ABC relativa ao vértice A mede 12. A base BC de ABC mede:
A) 6 \sqrt{2}
B)8 \sqrt{3}
C) 10 \sqrt{2}
D) 9 \sqrt{3}
E) 12 \sqrt{2}
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