5)
<AOC = 72
<ADC = 1/2 × <AOC = 1/2 × 72 = 36
<ABC = 180-36 = 144°
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5)
<AOC = 72
<ADC = 1/2 × <AOC = 1/2 × 72 = 36
<ABC = 180-36 = 144°