9514 1404 393
Answer:
(a) 25°
Step-by-step explanation:
The angle marked 93° is the average of the arcs intercepted by the secant lines.
(161° +AD)/2 = 93°
161° +AD = 186° . . . . . multiply by 2
AD = 25° . . . . . . . . . . .subtract 161°
