Question

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

Answer 1

Answer:

• 122°

-------------------

∠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°