17. Sejam os ângulos adjacentes AÔB, BÔC e CÔD tais que AÔB = 18 e CÔD = 24" . Calcule a medida do ângulo formado pelas bissetrizes dos ângulos AÔC e BÔD.
a) 6°
b) 12°
c) 21°
d) 25°
e) 33°​
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