Question

A circle is centered on point B. Points A, C and D lie on its
circumference.
If

Answer 1

• 122°

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∠ADC and ∠ABC subtend the same arc AC, hence ∠ABC is double the measure of ∠ADC:

• m∠ABC = 2*m∠ADC
• m∠ABC = 2*61°
• m∠ABC = 122°