Answer:
100°
Step-by-step explanation:
ARC AC is DOUBLE of the angle ABF (inscribed angle theorem).
The sum of 3 angles in a triangle is 180°.
Now, in Triangle ABF, AFB = 25, BAF = 105. that leaves us with angle ABF (or B). Thus, we can write:
AFB + BAF + ABC = 180
25 + 105 + ABF = 180
130 + ABF = 180
ABF = 180 - 130 = 50 (Angle B)
We know Arc AC is double of Angle ABF, so Arc AC = 2 * 50 = 100.
Arc AC = 100°
