Question

Please answer this question now

Answer 1

AB = 72°

Explanation:

The inscribed angle ADC is half the measure of its intercepted arc, thus

56° =
`(1)/(2)` ( m ABC ) ← multiply both sides by 2

112° = ABC

ABC = AB + BC = AB + 40, so

AB + 40 = 112 ( subtract 40 from both sides )

AB = 72°