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= 180 - 90 - 66 = 24
<BDC = <ADC - <ADB
= 78 - 24 = 54
<BCD = 180 - <DBC - <BDC
= 180 - 90 - 54 = 36
<BCE = <BCD / 2 = 36 / 2 = 18
b) <CED = 180 - <EDC - <ECD
= 180 - 54 - 18
= 108