Answer:
36°
Step-by-step explanation:
An angle whose vertex lies outside a circle whose sides are 2 secants of the circle is
angle = [tex]\frac{1}{2}[/tex] ( larger arc - smaller arc ), that is
42 = [tex]\frac{1}{2}[/tex] ( 120 - smaller ) ← multiply both sides by 2
84 = 120 - smaller, hence
smaller = 120 - 84 = 36°
