Question

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Answer 1

Explanation:

Angle formed at the circumference of the circle is half of the angle formed at the center of the same circle.

Hence,

`m\angle ADC = (1)/(2) * m\angle ABC \\ \\ \therefore \: m\angle ADC = (1)/(2) * 40 \degree \\ \\ \therefore \:m\angle ADC = 20 \degree \\ \\`